CN103576274A - Method for fixing objective lens of hard tube endoscope - Google Patents

Abstract

The invention belongs to the technical field of endoscopes, and particularly relates to a method for fixing an objective lens of a hard tube endoscope. A first negative set plane-concave lens of the objective lens, a steering prism and a third set plane-convex lens of the objective lens are glued into a component through the optical cement, and when being glued, the component can be precisely adjusted through an optical angle gauge. The method solves the technical problems that in the prior art, the method for fixing the hard tube endoscope is low in positioning precision and high in difficulty and has the advantages of being high in positioning precision, low in adjusting difficulty and good in sealing and waterproof performance.

Description

Rigid pipe endoscope object lens fixing means

Technical field

The invention belongs to endoscopic technique field, be specifically related to a kind of rigid pipe endoscope object lens fixing means.

Background technology

When being used, rigid pipe endoscope according to the position of observing object, need to use prism to change viewing directional angle.65 °～75 ° viewing directional angle prisms adopt half five corner structures conventionally, Figure 1 shows that large viewing directional angle endoscope lens optical system schematic diagram: it comprises first negative group of plano-concave lens of object lens 1, turns to prism 2 and follow-up positive lens; Described follow-up positive lens comprises the 3rd group of plano-convex lens 3 of object lens and other optical elements 6,7,8 of endoscope lens.When being used, rigid pipe endoscope according to the position of observing object, need to use prism to change viewing directional angle.

Traditional fixing means is for being used prism holder, first negative group of plano-concave lens of object lens 1, turn between prism 2 and follow-up positive lens three separate, Figure 2 shows that conventional endoscope steering structure schematic diagram, in this structure, first negative group of plano-concave lens of object lens 1, turn between prism 2 and the 3rd group of plano-convex lens 3 threes of object lens separate, positioning precision is low, and adjustment difficulty is large.While turning to 2 pairs, prism to turn to prism 2 to adjust by movement, the adjustment that turns to prism is to carry out in narrow and small endoscope pipe, narrow and small because of endoscope pipe, cannot detect, very difficult assurance turns to the adjustment precision of prism 2, causes rigid pipe endoscope image quality decrease; First negative group of plano-concave lens of object lens 1 should carry out water-tight, adjusts again its positional precision, debugs consuming timely, and assembly precision is very low, easily leaks.

Summary of the invention

The technical issues that need to address of the present invention are: first negative group of plano-concave lens of rigid pipe endoscope fixing means object lens 1 in prior art, turn between prism 2 and the 3rd group of plano-convex lens 3 threes of object lens separately, positioning precision is low, and adjustment difficulty is large.

Technical scheme of the present invention is as described below:

Step 1

Gummed turns to the plane of prism and the 3rd group of plano-convex lens of object lens;

Step 2

First negative group of plano-concave lens of object lens, along turning to the inclined-plane of prism to move, leaves adjusting play while designing between first negative group of plano-concave lens of object lens and the 3rd group of plano-convex lens;

Step 3

In first negative group of corresponding round territory of plano-concave lens concave surface clear aperture of object lens, plate anti-reflection film; Except plating anti-reflection film in first negative group of corresponding round territory of plano-concave lens concave surface clear aperture of object lens, equal silver-plated film at the position that turns to cemented surface between first negative group of plano-concave lens of prism and object lens;

Step 4

Turn to prism to be exposed to another reflecting surface gummed reflecting surface protection prism airborne, that do not contact with the 3rd group of plano-convex lens of object lens and first negative group of plano-concave lens of object lens, and on the side that turns to prism contacting with reflecting surface protection prism silver-plated film;

Step 5

It is benchmark that first negative group of plano-concave lens of object lens, the assembly that turns to prism, the 3rd group of plano-convex lens lens of object lens, reflecting surface protection prism to use optical cement to compose be take the 3rd group of plano-convex lens lens axis of object lens, use edge polisher cylindrical grinding, when this cylindrical is used for assembling and rigid pipe endoscope mirror pipe location;

Step 6

As an integral body, pack first negative group of plano-concave lens of object lens, the assembly that turns to prism, the 3rd group of plano-convex lens of object lens and protection prism cementing to become into endoscope pipe, form large viewing directional angle endoscope lens together with other optical elements of endoscope lens.

As preferred version, in step 1, use precision goniometer to detect the positional precision that turns to prism, carry out precision dress school.

Beneficial effect of the present invention is:

(1) solve the difficult problem that cannot detect, cannot guarantee the adjustment precision of prism when conventional endoscope turns to prism assembling, can high-quality have guaranteed the image quality of rigid pipe endoscope;

(2) as shown in Figure 3, by first negative group of plano-concave lens of object lens, to turn to the 3rd group of plano-convex lens of prism, object lens to use optical cement gummed be an assembly, during this assembly gummed, can use optical angle gauge to carry out precision adjustment, guarantee to turn to positioning precision and the endoscope steering angle precision of prism, positioning precision is high, and adjustment difficulty is little;

(3) increased contact area bonding between lens and mirror pipe, water-tight characteristic be improved significantly.

Accompanying drawing explanation

Fig. 1 is large viewing directional angle endoscope lens optical system schematic diagram;

Fig. 2 is existing object lens stationary installation schematic diagram;

Fig. 3 is for turning to the 3rd group of plano-convex lens gummed schematic diagram of prism and object lens;

Fig. 4 is that first negative group of plano-concave lens of object lens glues together schematic diagram mutually with turning to the 3rd group of plano-convex lens gummed part of prism and object lens;

Fig. 5 is for turning to first negative group of plano-concave lens gummed surface coating schematic diagram of prism and object lens;

Fig. 6 be reflectance coating protection prism with first negative group of plano-concave lens, turn to prism, the 3rd group of plano-convex lens of object lens to glue together part to glue together mutually schematic diagram;

Fig. 7 is for adopting the rigid pipe endoscope schematic diagram of fixing means assembling of the present invention.

In figure, first negative group of plano-concave lens of 1-object lens, 2-turns to prism, the 3rd group of plano-convex lens of 3-object lens, 4-reflectance coating protection prism, 5-adjusting play, other optical elements of 6 ~ 8-endoscope lens, 9-endoscope pipe.

Embodiment

Below in conjunction with drawings and Examples, rigid pipe endoscope object lens fixing means of the present invention is elaborated.

Step 1

As shown in Figure 3, turn to the plane of the 3rd group of plano-convex lens of prism and object lens first to glue together, can the accurate position of adjusting prism during gummed, guarantee positional precision between the two.Preferably use precision goniometer to detect the positional precision of prism, carry out precision dress school.

Step 2

As shown in Figure 4, first negative group of plano-concave lens of object lens is along turning to the inclined-plane of prism to move, while designing between first negative group of plano-concave lens of object lens and the 3rd group of plano-convex lens, leave adjusting play, guarantee that relative position between the two can adjust, so guarantee first negative group of plano-concave lens of object lens, turn to prism, the positional precision between the 3rd group of plano-convex lens lens of object lens.

Step 3

In first negative group of corresponding round territory of plano-concave lens concave surface clear aperture of object lens, plate anti-reflection film; As shown in Figure 5, except plating anti-reflection film in first negative group of corresponding round territory of plano-concave lens concave surface clear aperture of object lens, equal silver-plated film at the position that turns to cemented surface between first negative group of plano-concave lens of prism and object lens.Silverskin reflectivity is high, when improving the system efficiency of light energy utilization, can play the effect of eliminating veiling glare.

Step 4

As shown in Figure 6; turn to prism to be exposed to another reflecting surface gummed reflecting surface protection prism airborne, that do not contact with the 3rd group of plano-convex lens of object lens and first negative group of plano-concave lens of object lens; and on the side that turns to prism contacting with reflecting surface protection prism silver-plated film, improve luminous energy transmitance.

Step 5

It is benchmark that first negative group of plano-concave lens of object lens, the assembly that turns to prism, the 3rd group of plano-convex lens lens of object lens, reflecting surface protection prism to use optical cement to compose be take the 3rd group of plano-convex lens lens axis of object lens; use edge polisher cylindrical grinding; when this cylindrical is used for assembling and rigid pipe endoscope mirror pipe location; compare the contact area having increased when bonding between lens and mirror pipe with traditional fixing means, water-tight characteristic is obviously improved.

Step 6

As shown in Figure 7; as an integral body, pack first negative group of plano-concave lens of object lens, the assembly that turns to prism, the 3rd group of plano-convex lens of object lens and protection prism cementing to become into endoscope pipe, form large viewing directional angle endoscope lens together with other optical elements of endoscope lens.

Claims (2)

1. rigid pipe endoscope object lens fixing means, is characterized in that: comprise the following steps:

Step 1

Gummed turns to the plane of prism and the 3rd group of plano-convex lens of object lens;

Step 2

First negative group of plano-concave lens of object lens, along turning to the inclined-plane of prism to move, leaves adjusting play while designing between first negative group of plano-concave lens of object lens and the 3rd group of plano-convex lens;

Step 3

In first negative group of corresponding round territory of plano-concave lens concave surface clear aperture of object lens, plate anti-reflection film; Except plating anti-reflection film in first negative group of corresponding round territory of plano-concave lens concave surface clear aperture of object lens, equal silver-plated film at the position that turns to cemented surface between first negative group of plano-concave lens of prism and object lens;

Step 4

Turn to prism to be exposed to another reflecting surface gummed reflecting surface protection prism airborne, that do not contact with the 3rd group of plano-convex lens of object lens and first negative group of plano-concave lens of object lens, and on the side that turns to prism contacting with reflecting surface protection prism silver-plated film;

Step 5

It is benchmark that first negative group of plano-concave lens of object lens, the assembly that turns to prism, the 3rd group of plano-convex lens lens of object lens, reflecting surface protection prism to use optical cement to compose be take the 3rd group of plano-convex lens lens axis of object lens, use edge polisher cylindrical grinding, when this cylindrical is used for assembling and rigid pipe endoscope mirror pipe location;

Step 6

As an integral body, pack first negative group of plano-concave lens of object lens, the assembly that turns to prism, the 3rd group of plano-convex lens of object lens and protection prism cementing to become into endoscope pipe, form large viewing directional angle endoscope lens together with other optical elements of endoscope lens.

2. rigid pipe endoscope object lens fixing means according to claim 1, is characterized in that:

In step 1, use precision goniometer to detect the positional precision that turns to prism, carry out precision dress school.

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