JPS5931908A - Lens holder - Google Patents

Abstract

PURPOSE:To vary an air cap and to correct the focus movement of a lens system due to temperature variation, and to hold a plastic lens at an invariably correct position, by moving an inner lens frame arranged in a lens frame in an optical-axis direction. CONSTITUTION:The inner lens frame 32 is set in the lens frame 30 at specific temperature by guiding a lens 42 to a specific designed position through their screw parts 31 and 47. Then while the position is not shifted, a rotary ring 34 for temperature compensation is inserted between the inner lens frame 32 and lens frame 30. If temperature variation occurs in said state, each bimetal 38 varies in curvature to rotate the inner frame 32 through the screw parts 31 and 47 relatively to the lens frame 30, moving the lens 42 in the optical-axis direction. Thus, the air gap is varied according to the temperature to correct the movement of the focal point.

Description

[Detailed description of the invention]

The present invention relates to a lens holding device that holds a lens within a lens frame. Samurai improved the lens performance by fixing the plastic lens, which has weak temperature resistance, inside the frame so that its shape would not change due to temperature changes. Lasts 71.
In addition to providing a lens thread with a strong A degree property, the use temperature of plastic lenses and other lenses without a degree property is +1'i>14ti. Conventionally, lenses, such as glass lenses 7 and 2 frames 2
When it is installed inside the
Lens of frame 2 ff λ Frame 1 Jin Attachment 4 to back outer periphery 7 a 'Y of plastic lens 7 4: j: l, t lens 5' 1 Plastic lens 7 in frame fitting part 5
r' and 92 l installed on the inner circumference of 65 frame 2,
:, Frame screw: lj 3, screw j'lFj 6 installed on the outer periphery of presser foot ε11, and insert presser Mi 1\screw inside Q frame 2 while screwing 4 together.
The contact edge 1a with the plastic lens 7 formed on the periphery is the outer periphery 7b of the white surface 1.1 of the plastic lens 7.
1. by pressing into contact with and fixing the plus deck lens 7 within the lens frame 2. ; has been accomplished. Now, after assembling the plastic lens 7 with the configuration shown above onto the lens frame 2 at room temperature, it was exposed to a high temperature atmosphere. 4. Since the expansion coefficient of the molding glue A of the upper frame 2 and the presser ring 1 is larger than that of the adhesive, the clearance of the lens frame fitting portion 5 in the storage frame 2 is small (1x). Furthermore, this shadow (lt): 'b is most noticeable at the contact area 8 (first
(Refer to the enlarged view shown in Figure bK), when the part is assembled at room temperature, the clearance is already zero (11u), and in the high temperature atmosphere, the lens 7 and the presser...
The difference in thermal expansion coefficient σ) of the molded material at f>, ``j'' directly affects the surface shape.
≦8 degrees Celsius, presser foot r, ii front side σ) outer periphery of lens 7 where abutment edge 1a of presser foot r, ii l presser foot zll; A 1 a tells 4 that the lens 7 has zero clearance, 1111?
＋、It turns out. Therefore, as the temperature increases, the plastic lens 7 begins to expand in the radical direction, but the deformation of the plastic lens 7 in the radial direction is restricted by the restriction by the presser foot 7!1. Thermal stress is generated inside the lens 7. In addition, the thermal stress caused by the plus boot cleanse 71'J f"iB is not subject to regulation ￥) Y: Deformation VC in the egg direction throughout the year, and the plastic lens 7 or 'l'
To cause deformation in the power cycle, it becomes K〇of plastic lens 7) "(, i:, il 77, oppressing love power cycle σ) 1σF, but lack?, in short, E4S I
U'J CiCM Shi I-71'; i A 1.1 &
) J', because it is regulated by the presser foot J shoulder l, the book I
The expansion is centered at 11'(A +3, and as a result, the curvature is half (
(-7, +・Small. Gland 1t) 3 tension! Let α be approximated to . Conversely, the plastic lens 7 and the ζ゛1313 frame 1. E2 of the molding material; Iff 7. depending on the compatibility of the expansion control.
! Add 1 c to lA. Accordingly, weft frame 2 and presser foot 3. (1
Compared to the shrinkage of the plastic lens 7, the shrinkage of the plastic lens 7 is thicker.
-23 The frame 2 and the presser mound 1 try to contract more than the contraction, but in this case too, the presser ring l contacts Cfl! As a result of the restriction on the outer peripheral edge 7b of the plastic lens 7 fixed by pressure contact of lR, the plastic lens 7 may shrink more than the contraction of the presser ring 1, as in the case at high temperatures. As a result, thermal stress is generated inside the glass lens 7, and this thermal stress is concentrated in the optical direction of the plastic lens 7, which is not restricted by the presser foot 1, causing deformation 7 of the plastic lens 70 in the optical axis direction. Therefore, considering the cross section in the axial direction including the elementary axis of the plastic lens 70 shown in Fig. 1d, since the length of the first chord AB is regulated by the presser ring 1, it contracts to the arc AB. is concentrated, and as a result, the radius of curvature becomes larger. Assuming that the length of the arc when warm is AIB+, and the linear expansion coefficient of the molding material of the plastic lens 7 is α. Approximate to AIBI÷AB-(1-αt). Therefore, from the above, when the plastic lens 7 is mounted in the conventional IK lens frame 2, the radius of curvature of the plastic lens 7 changes due to temperature changes. That is, it is clear that it is small at high temperatures and becomes large at low i7.1, and also that the focus position WL' is largely shifted and various aberrations are worsened compared to at room temperature. In addition, in the conventional lens and lens frame σ) configuration, the first
As shown in FIG.
4, the frictional resistance' between the two lenses 21 and 22 that are adjacent to each other by their outer peripheral edges is reduced.
? A composite lens constructed to reduce the temperature and prevent misalignment of the lenses placed between the lenses 21 and 22 was proposed in Japanese Utility Model Application Publication No. 55-138606. However, in this case (1?component σ), two lenses 21.
By simply reducing the friction between lenses 21 and 22,
The lens 21. is fixed within the fitting portion 26 by the retaining ring 25, and there is no change in any part from the conventional 4'j7 configuration.
22, the outer diameter of which is 1/2mm
Or presser foot U2250 internal expedition", SuJ, 1 no, controlled,
Similar to the glass lens 7, both lenses 21.2
It is not possible to prevent changes in the temperature and the focus position 1 to 1' due to temperature changes, resulting in a shift in the focus position and worsening of aberrations. It's impossible. Therefore, in the conventional lens mounting configuration for the color frame, changes in the radius of curvature that occur due to changes in the degree of variation can be prevented, and the focus position will be 1° or 1°, and aggravation of various aberrations will be aggravated. There is a need for a lens holding structure that does not cause the above-mentioned lens holding device σ), or other appropriate countermeasures. Eliminate defects

[-1 previous nl', 9. ! In the following, each embodiment of the lens holding device (B) of the present invention will be explained in detail with reference to the drawings. A first embodiment of the lens holding device is shown,
Part of Figure 2a is 7 vertical sections (IQ view, Figure 2A is the 2nd
11″l to the left of the center in the A-A cross-sectional view of figure a:
1 is omitted. In the same case, 30 is a box frame, and this σ) Q frame 30
A screw i31'& is provided on the inner periphery of the internal mirror frame 32'ff, and an internal mirror frame 32'ff is rotatably screwed in this threaded portion 31. Also, on the front inner periphery of the G6f frame 30, there is a rotating ring 34σ for temperature compensation ffj] engagement river unevenness i'! 33 yen is provided, and the inside (3 frame 32σ) front (i1jl has uneven grooves 35'& provided on the outer periphery, (J frame 30σ) inner periphery and inner t' to frame 32.
The temperature compensation rotary ring 34 is placed between the outer circles of the rotary ring 34. 'f, frame 30
The inner circumferential portion 37 of the rotating ring engages with the uneven front 33 of the
The front 37av of the unevenness engages with the uneven groove 35 of the inner frame 32, and the outer peripheral part 36 of the rotating ring and the inner peripheral part 370 of the rotating ring
The two are connected by each bimetal 38 (see Figure 2). In addition, on the inner periphery of the inner bell frame 32, there is a lens:...l (z-eye
139 and the threaded portion 41 of the presser foot 40? It is a provision. 42 is the inner mirror frame 32]v:y exchange (B', i'+43r'
lFC collection g: ゛+, screwed part 41&C screwed presser foot 1-
・It is a lens that is hardened by 51 by 40, and a concave j++44 is provided on the outer periphery of this lens 42, and this gate structure 445
-'Intermediate 1- Then, a deformation absorbing part 45 made of a hollow tube having a shape of 1) +2 is removed on the outer periphery of the lens 42 with a large elastic deformation field Ft, and a lens printing part 39 and a presser with i' + il are removed. 4 (45 deformation absorbers are interposed between 1 and 42 lenses are housed and held within the frame 32. In addition, in the figure, 46 is inserted) Rei 111I in frame 30? fij
It is stored inside and holds the first lunz ($, z). Therefore, in the lens holding device 31' having the above-mentioned structure, the inner lens frame 32 is inserted into the frame 30 at the threaded portions 31 and 47 under a certain temperature, and the lens 42 is held at a predetermined designed position. Set σ) to 11"1. Next, set the temperature t + & (l
'(111 rotating ring 34 to inner latitude frame 32 and C-1 frame 3 (
) σ) Charge between. When the state changes from this state to 7i1'A, the curvature of each metal 38 changes, and the curvature becomes thicker (or smaller). 47' (rotated via Lj, the lens 42σ) is rotated in the direction of the original axis B) when the rotating ring inner circumferential portion 37
and times, P7 IJ ring outer periphery 36 is lens 42σ) element 1
It varies depending on the number of draws, but this transition 11.
It can be absorbed in the form of By this (1') Yo&C-on PL? , 4) Heat point position 1 by changing in kalpa η for 1 time
1゛tσ) fi"41iQBn sleeveless shi) can be done. Also, when this lens system is held in a high ?llR state and goes to ℃, suppose ``1 bay'' of the lens 42 is made of glass J). Due to the difference in the expansion coefficients of the materials, stress is generated in the lens 42 due to temperature, causing the lens 42 to deform.
Become. However, since the deformation absorbing FAB 45 located between the lens 42 and the endoscope frame 32 deforms first, the lens 42
It is possible to fix your own glue in the form of +7H small eyes.In this way, depending on the temperature, the score is 1:).
II vc, let's make the air space 1i' threat 'ire vs/,'iL l, ,IW,! Even if stress σ) and backlash occur due to expansion and contraction of the lens due to Iα2, the lens 420 and a half? )′, direction 0> −, i l),:
<, i':j as a means of absorbing LIj
3++ J-type absorption part old 45 can absorb and cope with the problem 71'- while maintaining the optical performance of lens 420 of 6.1r:! You can hold 1 E in the frame 30. Figure 3 (shows the second embodiment)
Although the radial rotation θ) dimension of the lens 420 and the structure of the means for absorbing 3- are different, the other components σN+') are the same as in the first embodiment. That is, when storing the lens 42 in the lens fitting part 43 of the frame 32, the lens 42 is made of an annular body made of a material with a large tensile deformation 1j1°≧Shape absorption name 1~ After inserting the hole 48 into the lens fitting part 43, presser foot ψ40
This is achieved by suppressing and fixing t). Now, if the lens system of the lens holding device i'r consisting of the cylindrical and Due to the difference in the expansion coefficients of the materials of lens 42 and lens 42, stress is generated in lens 42.
Deformation is about to occur. However, the deformation absorbing portion t148 interposed between the lens 42 and the inner opening frame 32 does not come out! Due to the elastic deformation of the a-corner 49, the lens 42 is always held against the presser foot 40, and as a result, the optical performance of the lens can be maintained by the same effect as in the first embodiment. can. In addition, in J13 construction & engineering of the means for correcting the focal position due to temperature changes of the lens 42, the following m3 to 11th embodiments all have the same structure as the first embodiment. I will omit the explanation. However, <1.7 formation σ> of the following 3rd to 11th examples
The feature is that a means is provided for absorbing dimensional changes in the radial direction σ of the lens 420 when the lens 42 is housed in the lens fitting portion 43 of the Q frame 32 in the Q frame 32, as shown in FIG. The same means in the third embodiment includes the lens 42
By interposing the deformation absorbing sleeve 50 between the outer periphery of the lens fitting portion 43 and the lens fitting portion 43, E.7 is achieved. In addition, the deformation absorbing sleeve 5 (1i, r, elastic bar 4σ) is smaller than the toolastic lens 42, making it 7. ．． 1st resin, 1st type material is nylon, PA, A138, etc.;)
It is formed by 1°C. C'b 4 Established "" Cance Hold i; E, J"i
K ('+', r, "y Sita plastic lens 42 K, !! degree change get tj circulation fufu and [[al I
/ns 42 is 1nt L by cold convex red lily return,
So σ) j; ", jl that occurs in the radial direction at 1 temperature
j, +1. Better than C2 powerless plastic lens 42
Due to the elastic deformation of the small deformation absorbing sleeve 50, the elastic deformation of the small deformation absorbing sleeve 50 can absorb the force D' and prevent the plastic lens from becoming 420 curves and 14 radius σ).
In conjunction with the effects exerted by the other 414 components,
f, ff 1 real/I (11 A: VCJ' as in 1.14)
r period>, h 41': can be obtained. Moreover, the deviation of the optical axes of the plastic lens 42 and the inner C frame 32 (τt, 1 point σ in the conventional technology) ljQ clearance between the plastic lens and the inner mirror frame is due to the stress due to thermal expansion, that is, the change in the radius of curvature. Since the key-shaped absorbent sleeve 50 absorbs and prevents damage, it has the advantage that it can be set small. FIG. 5 shows a 21!4 embodiment, which is also different in the structure of the means for absorbing dimensional changes in the radial direction of the lens, and the other structures are the same as in the first embodiment. The means includes the inner barrel and the lens fitting portion 43 of the frame 32.
It is constructed by protruding seven deformation absorbing flange 51 on the inner periphery at the 5th Q, and the Q frame 3 inside the lens 42.
2, and after melting the lens 8 to the attachment part 39, screw the presser foot U340 onto the screw 41, and remove the lens 4.
Fix 2. (Glassic lens 42 held under 1.1 formation)
When a temperature change is applied to the plastic lens 42, the plastic lens 42 expands and contracts with the change in temperature and temperature.
This can be absorbed by the t-type deformation, and a change in the radius of curvature of the glass deck lens 42 can be prevented. In addition, a lens 42 is provided on the inner periphery of the seven flange 31 for absorbing deformation in the figure.
0U (A joint 52 is provided. Figure 6 shows the fifth embodiment. Lens σ in the example of MIi.) The means for absorbing dimensional changes in the radial direction consists of the following structure. , I, ji4's (jr construction O construction 1st; I+ Example) Formed on the inner wall of the inner ore frame netting fji old man'
:! :I do. This rear friction washer 54σ) shape (upper ball 1.t: l
Ik fitting 7'; jj43 can be fitted, and the endoscope frame 1'' (・1
With? The contact portion between '+li 3' 9 and the lens 42 is in the form of a flat sheet with a shape of 1rV and a length of 7L'''C.
J quality has a small Jk friction coefficient γ; 1144-, for example, it is formed from Teflon (trade name)-based element tj' VC, and its J coefficient is μ = 0.08 to 0.15; i' + 4 /It is a river. In addition, it is also possible to use the missing materials of Iya.
2 The friction coefficient is 11] in the above μσ] range, and a synthetic tree with a 12 degree glue/it property, and other equivalent effects? ,... It is desirable to use the advantage. Next, the plastic lens 42
The inner mirror frame fitting portion 43 is brought into contact with the rear friction washer 54 from the lower plane 1+l:1. Then, further push the front frictional gloss 55 inward or into the - frame 32, and apply it to the 1- of the lens 42 on the surface 1ftl+.
1, and the retaining ring 40 is screwed into the threaded portion 41 formed on the inner wall of the inner bell frame 32σ) to hold the front friction washer 55 and the lens 42. Since the lens is held in the lens holding device a assembled in this manner with the friction washers 54 and 55 interposed, there is a 12.4 degree change during use. Expansion and contraction of the lens σ) due to temperature changes will be absorbed by the friction washers 54 and 55. As mentioned above, since the coefficient of friction of the friction washers is small, the lens 42 and the rear Friction washer 54 and lens 4
2 and the front friction washer 55σ) is reduced. Therefore, the lens 42 can be deformed in the radial direction despite the relative physical change force (f!) due to temperature change, and therefore, the radius of curvature of the lens does not change, and the lens does not wobble, etc. FIG. 7 shows a sixth embodiment Y of the present invention, in which the following configuration is used in the first embodiment.
Unlike the embodiment, other keys and forces are the same as in the first embodiment. Now, in the construction drawing 7, the plastic lens 42 to be fixed is inserted into the inner peripheral surface of the inner C frame 32, which is formed in the shape of a circle fi'+'+. The lens 8 for
l+j section', plus deck lens 4 on the t111 C circumferential surface
2 Y jJi 7i, 41 is formed on the screw B1 for knee t. Previous 7:1 Synergy j'il'141 Vt
-! In order to press the screw together, it has a holding field 40 (Q21<shape σ formed on the outer periphery). Presser foot 4
Press the peripheral end surface of the plastic lens 42Q to 0. An annular step portion 40a is formed along the inner periphery of the fll1 surface, and this p4-shaped step portion 408 is integrally formed with an elastic body 56 lined with rubber. The present embodiment has the above-mentioned configuration, and the plastic lens 42 is inserted into the inner mirror frame 32.
Insert it into the presser ring screw fill 5-7 Y (・°
By screwing the glass lens 420 onto the threaded portion 41 of the frame 32 with a heating stage, the glass lens 420 can be fixed by being elastically pressed by the elastic body 56 on the peripheral end surface. Therefore, even if the plastic lens 42 which is held down and fixed by the elastic body 56 of the retaining ring 400 changes in X degrees and dimensional changes occur due to expansion and contraction in the radial direction, the single elastic body 56 absorbs it. Therefore, there is no change in the radius of curvature of the plastic lens 42, and rattling or the like can be prevented. The effects of the other components are as explained in the first embodiment. FIG. 8 shows a seventh embodiment of the present invention, where 58 is a lens body, and this lens body 58 is molded from a plus deck material such as acrylic resin. In addition, a foam layer for absorbing lens deformation is provided along the entire circumference of the lens body 58σ), and this foam layer 59
After the lens body 58 is molded, it can be integrally molded on the outer periphery of the lens body 58, and the lens body 58 can be made of the same material 1, for example, acrylic resin, mixed with a foaming agent and foamed. ℃ foamed layer 59 can be formed in the forming process on the outer periphery of the . Also, along the outer periphery of the lens body 58, foamed I.+,
159'tA: When molding, in order to make the bond between the two parts more solid, the outer circumference Kl ? if- 1 men's unforced 60 are integrally protruded, and via this lens anchor 60, from the front R self-foaming layer 596, molding 2, and C ,
When molding the Jlj/J layer 59, a molding die is used to form the Jlj/J layer 59, so that the Jlj/J layer 59 is formed in the same mold. LI)', the surface layer f of the foam layer 59 which is shaped like
is skinno υ□i 6]? It can be integrally formed into an IIV type. KL, all 2; q layer 590 strokes" 11ν, both 1) lens anchor 60 and skin If;'t 61
Regarding 1?1, [2 is not necessarily required to implement the present invention. In addition, the molding material of the lens body 58 is not limited to plastic, and glass may of course be used, and the foam layer 59 may be made of a material whose elastic modulus is smaller than that of the molding material of the lens body 5B. It is preferable to carry out the process while selecting the lens body.
S li, l bile or other σ) molding material 19!
It is molded while being used. Now, with the above 4'r7 bl, the self-deformable absorption lens 62 is mounted in the inner mirror frame 32: 'i' J, i-'
+, then ff-1 on the outer periphery of the lens body 58, α
One side 59 of the girder foam layer 59. L is the inner lead, and the lens body 5 is brought into contact with the lens IJlln attachment part 39 of the frame 32.
8 foam layer 59 to the inner flap frame 32Q] lens fitting part 43 f
f [, (By combining, the self-deforming absorbing lens 62
Load it into Q frame 32 inside the main compartment. After that, while screwing the threaded part 57 of the screw part fQ' 40 'i into the threaded part 41 of the inner lens frame 32, the inner part 1. ' While screwing into the space frame 32, the pressing surface 40 of this presser foot 40
a on the other side 1 of the foam layer 59 of the self-deforming absorption lens 62
591] and the same lens 627 while adding ili 4j2
It is fixed by the pusher jλ40. In addition, previous hC] Self-molding absorption lens σ): 9. Foam layer 5
9, the outer side (and the inner f,''! Lens Ir of frame 32
The clearance between the inner diameter and the F joint 43 is generally θ)
This can be designed and implemented in the same way as the glass lens and the installation H1 at the t・1; Under such a configuration, when the self-deforming absorption lens 62 deforms due to temperature change, that is, as the temperature increases, the lens hole 11.5 becomes I::2'7.
By doing this, the setting sun of the foam layer 59-b and inner 4:・
, frame 3217) ftG: Even if the clearance with the inner diameter of the joining part 43 becomes zero, the radial direction of the lens body 58 σ) 1:・Moon 1G can be absorbed by the foam layer 59 once in the evening σ) The conclusion! It is possible to prevent the occurrence of thermal stress in the lens body 58, and also to prevent the occurrence of large changes in the lens shape. Furthermore, shrinkage of the lens body 58σ) in the radial direction due to a decrease in temperature can be absorbed by the foamed knee 759, and the same effect %p can be obtained. Furthermore, press the lens body 58 directly with the press 5:! 40, it is inevitable that the loosening torque will be significantly reduced due to the stress relaxation of the lens body 58. However, in the case of the self-deformation absorbing lens 62 of this embodiment, the lens body 58 is formed along the outer periphery. side surface 59bY of foam layer 59
A tail that can be fixed while being pressed by the presser foot 40, the pressing surface 40B of the presser foot 40 and the side surface 5 of the foam layer 59
Stress relaxation (''s) between 9b and 9b can be absorbed by the foam layer 59, and a secondary effect can be obtained that can prevent the loosening torque of the presser foot 40. 8. Lens holder [d] showing an embodiment, and B'fJ a is a side sectional view including the optical axis, and t is a sectional view of the lens assembly section taken along line 3-Bl in FIG. 32 is the inside of the work, the I frame, 41 is the screw part, 39 is the lens 811 attached part, 43 is the lens fE joint part, and 42 is the lens. Embodiment 4: This is the same as the 'f configuration.However, inside the lens assembly portion 39), an elastic shape presser portion 63 is provided according to the present invention.This elastic shape presser portion 63
is integrally formed of the same material as the lens assembly part 39, for example synthetic wood or metal, and the lens 81F
It is formed as a protruding edge along the inner circumferential surface of the l-attached portion 39. Also, as shown in Fig. 9, a plurality of notches 0 can be arbitrarily set.
4, the elastic shape presser portions 63 are provided intermittently. However, the tip of the elastic shape presser portion 63 has a predetermined unidirectionality over its diameter. -65 is a flange 652 f Jl, a 1:3 friction piece, and a ring-shaped 2-damping member. σ) p4 @ E) The growth/decrease member 65 is! (With a small member of the catfish, 1,000'3 coefficient II = 0.08 ~ 0.154j,!1. (Teflon (tetrafluoroethylene) material) Physically, it is a Western pair Haron Kogyo K, manufactured by "Rulon J"
(++', r product name) or Nitto Electric Industry Co., Ltd., can use other materials that have the same effect, such as "Nidoflon" (product name). Also, the outside of 7 lunge 65a ≦ Gei! il entry' +
'+7. It is formed to be slightly thicker than the inner diameter of the shape holding part 63, and thereby, as shown in FIG.
When the flange 65a is fitted into the joint 43, the flange 65a is also pressed into the elastic shape.
'l''F Deformation It' *-The elasticity of TiB 03 in the axial direction, that is, the pressing force, fixes the IQ5 damping member 65. 42 Y I”
-"j';': A'<'J': In white contact with the member 65, and further outside) 11j, the screw name: ) is shaped D'Z. The lens 42, which is screwed into the threaded portion 41 which has been screwed into place, is held and fixed. Note that the lens 42 has its peripheral edge formed as a parallel surface so that it can be stably fixed. Further, the upper retainer 5140 is made of the same Teflon material as the friction damping member 65 according to the present invention. However, the material for forming the presser ring 40 is not limited to this material, and may be made of metal, for example. In this case, the effect of the present invention will be slightly reduced, but if the optical performance of the lens (plastic lens) against temperature changes is acceptable, it can be used selectively as necessary because it has high rigidity and can be made compact. obtain. However, in the lens holding device assembled in this way, the lens 42 is held at °C by the friction damping member 65 and the presser l140 with a small friction coefficient, so even if there is a temperature change during use, Expansion and contraction of the lens due to the change will not be prevented in the radial direction by the friction damping member 65 and the holding member 40. This is because the friction coefficient of the contact portion of the lens 420 is small, so the frictional resistance is reduced.
0 can be deformed in the radial direction even though there is a relative volume change due to temperature change etc. Moreover, in the lens holding device i-1+' according to the present embodiment, the damping part 65 is integrally attached to the lens body attachment part 39, and the holding part 40 itself is formed of a member with a small coefficient of friction. Therefore, when assembling the parts, the accuracy (the process is almost the same as before, and the accuracy of HfSl)lσ) does not change to %jlj. In this way, the movement of the focusing lens 111'' due to temperature is dealt with by changing the air spacing as shown in the first embodiment.
Generation of stress due to expansion and contraction of the meat due to temperature,
Regarding the occurrence of backlash, please use the lens holding means σ that has reached ℃.
) The optical performance of the lens should be maintained by adjusting the configuration. FIGS. 10a and 10b show a ninth embodiment e11 of the present invention. A lens Il [n1 attached portion 39 and a fitting portion 43 are formed on the inner mirror frame 32 to engage with the plastic lens 42Y according to the present invention. A retaining ring 4 is attached to a threaded portion 41 formed on the endoscope frame 32.
0 screws to hold the 42 lenses in place. According to the present invention, the pressing surface 4 of the lens 42σ) presser ring 40
66 protrusions are formed on 0a. In the example shown in FIG. 10, the protrusions 66 are a plurality of substantially hemispherical protrusions arranged at equal intervals on a circle centered on the optical axis on the slope. The pressing surface 40a of the holding ring 40 on the lens side is a monkey-shaped surface perpendicular to the optical axis. With the above-mentioned configuration, the lens 42 comes into contact with the pressing surface 40a of the holding ring 4° in a hemispherical shape σ) and the tops of the plurality of protrusions 66 in a very small area σ), causing friction during relative thermal expansion and contraction.
7ξ Carry out a small slip 'v of resistance. The pressing surface 40R of the presser ring 40 is parallel to the netted portion 39 of the inner hook frame 32, and the resistance does not increase or decrease when the lens σ) relative slides. Therefore, when the lens 42 undergoes relative expansion and contraction due to temperature changes, it moves freely in the radial direction, and therefore the lens curvature radius does not change (there is no accumulation of energy). The change in the radius of curvature is extremely small, and the resulting deviation from focus is within the specified tolerance range, so is temperature correction for focus -10fi\σ) necessary?1.
c (becomes. Figures 11a and 11b show the first embodiment of the present invention;
Form the l111.1 attaching part 39 and the fitting part 43 on the frame 32, and engage the lenses 42. The structure in which the lens 42 is held at a predetermined position by screwing the presser foot 40'r into the threaded portion 41 formed on the inner bell frame 32 is the same as that of the ninth embodiment. However, there is a difference in that the hemispherical protrusion 671' is formed as small protrusions spaced at several intervals on the surface of the 7171 lens barrel attachment part 39σ shown in FIG. Nisu 2). Similarly, the hemispherical notch 68 on the lens side surface of the presser foot 40 is the same as shown in Figure 11. E position j @ K between 1゛i?
ItI) The difference is that it is formed as a small protrusion. For example, a parallel portion 69 is formed on the outer periphery of the lens 42σ to prevent oblique force from occurring when the presser piece 40 is tightened. With the above-mentioned configuration, when a temperature change occurs, whether there is a relative movement in the radial direction σ) between the Zurastic lens 42, the inner mirror frame 32, and the presser ring 40, the applied force of the presser ring 40 is Since it occurs only in the direction σ) parallel to +lNi, if the restraining force is σ, lj on the radial direction group 1, it is poor. Furthermore, press between each protrusion 67 of the 8-to-4 attaching part 39 and the lens 42 and 03,
C3'f:j 4 Q (7) Protrusion 'UIS 6' 8
Tones, 12 o] Parallel 7; Between B69'
The friction force on the second seat is small. So L11 ke, 1/ns 426e is g freely f duck 1 shape, collection K" + t; 'I row 1 "I, inside lens 42 or in contact with the inner circumferential surface of low goshu-43. For the first time, the radius of curvature changes.
), the relative heat j expansion/contraction is g freely ♀j7(
Since the purpose is to make the contact 171i jlt small, it is practically effective, and therefore the method is limited to the method shown in the figure. The overall effect of the other configurations of the example σ) Method 1 was described in the ninth embodiment. '1' Q n dema)ru. FIG. 12 is a vertical cross section of the first embodiment of the present invention. An acupuncture part 70 is integrally provided on the internal lens frame 32, this internal mirror frame 32σ), the lens barrel mounting surface 39, and this σl (IAI (χ)), and the presser ring 40 is equipped with a screw. A threaded portion 57 that screws into the portion 41 and a fitting portion 71 and 7 are provided for the pressing surface 40aK.The lens 42 is provided with a buffer portion and an i4V flesh portion 72 is formed around the lens.Such a lens 42 is attached to the inner chain frame 32. After being inserted into the interior, the threaded portion 57v of the presser foot 40 is aligned with the threaded portion 41, and with a predetermined screw-in pressure, the lens thin-walled portion 72 is brought into pressure contact between the lens thin portion 72, the lens body supporting surface 39a, and the pressing surface 40a.Thus, the lens 42 Inner frame 32σ) is fixed in a predetermined position.As will be described later, since the lens thin portion 22 absorbs the stress of the lens (σ), it is not possible to press the 71ftli with strong force. In some cases, the lens 420 position is not properly fixed and held.Therefore, a ring-shaped edge with a circular cross section is provided on the outer periphery of the lens 42 through a thinner part 72 that is thicker than the lens 42. A fitting part 73 for sealing is formed, and the fitting part 71 of the presser foot 40 and the inner stud frame 42 side σ-) fitting part 7o
It should be held between the Holding the lens assembled in this way = 14°C When the lens 42 is brought to a high temperature, the difference between the linear expansion coefficient of the inner ψ frame 32 and the linear expansion coefficient of the plastic, which is the fourth material of the lens 420, causes the lens to Compressive thermal stress occurs within 42. However, this thermal stress is maximum at the lens periphery thin wall portion 72 where the cross-sectional area σ is the smallest, causing wrinkles and
Deformation of the lens 42 itself can be minimized by the occurrence of deformation such as waviness (σ). In addition, the lens 42θ, which may cause C due to the deformation of the thin portion 72 (J) (the center of the lens 42θ) (the center of the lens, the center of the lens, the thin portion 727, and the barrel attachment surface 39a that is held at the closest part to the lens) A wheel is formed to prevent temperature by the pressing surface 40a of the presser foot 4°.Also, the inner circumference 39bθ) of the lens barrel attachment surface 39 is the inner diameter of the lens peripheral thin wall portion 72 of the lens 42? The inner diameter of the lens body attachment surface 39 is considerably thicker than the outer diameter of the lens 42 (it is necessary to keep the inner diameter of the lens 42 at its maximum position). In this way, with the plastic lens of the present invention, the thin part 72 provided at the periphery is used for the loose binding process, so the lens stress caused by temperature changes is absorbed, and the lens stress is absorbed. Deformation can be effectively prevented and the lens performance can be kept constant.As shown in each of the examples above, the air gap can be changed by moving the inner lens frame installed inside the frame in the optical axis direction. The lens system (σ) that occurs due to temperature changes is compensated for (due to changes in the refractive index of the plastic lens and changes in the shape of the plastic lens). By providing an absorbing part, a buffer part, or a means for reducing frictional resistance, the attachment of the lens can always be maintained in the correct alignment, and since no local stress is generated, it is possible to It is possible to provide a lens holding device that can prevent shape change fire, eliminate the aforementioned drawbacks of conventional lens holding devices of this type, and improve and maintain the optical performance of the lens. It is possible to expand the operating temperature range of a lens system using a dynamic glass lens Y.

[Brief explanation of drawings]

Figures 1a-e show conventional lenses 1" and 1":
f: '+Y shown, Figure 1 a) X side cross section 1 piece 1, yH
l h'<l b 2° 1' 51 Enlarged sectional view in Figure a, Figure 1 C1 (1 = 21st l:<) aσ) Lens holding device quadruple radius σ
) Explanatory diagram showing the changes, Figure 1 C & J, ";j 11';
l a σ) Example dimensions 1! 11 cross-section, 1° Figures 2 to 12 are according to the invention 1 to 11';
f・11 is shown in Figure 2a, Figures 3 to 8, Figure 9
, No. 101゛21a. Figure 11.12 shows each example σ)-1 ratio? ,hY Ifノ(11111 plane (・do 1, 211YI b, Figure 9 is the same part 1 cleared (l (resting plane 1′N, 10th νl
b+! The ninth embodiment is a front view of a part of the lens IjF in the ninth embodiment. 30... Lens frame 31.41.47... Screw (', 1) 32... Inner bell frame 33.35.36a, 37; ]... Engagement unevenness j1 work 34... Temperature compensation Rotating ring 36... Rotating ring outer circumferential part 37... Rotating ring inner circumferential part 38... Bimetal 39... Lens l1li4 support part 40... Holder 42... 1/lens 43... Lens a fitting portion 44...Concave 11'1 45.48...Deformation absorbing member 46...2J! , Luns 49...Front corner 50...Deformation absorption sleeve 51...Smile-shaped absorption 111 Flange 52...Fitting part 54.55...li"4': i washer 5G...
Lit body 57...Presser 1 shell screw part 58...Lens body 59...Foam layer 60...Lens anchor 61...Skin R4 62...Self-deformable absorption lens 63... Elastic shape holding part 64...notch part 65...friction r, 1-fading member 66, 67, 68... protruding part 69... parallel part 70.71... fitting part 72...・N: γ Meat IB 0 1 [Ten'F Dekomanto Olympus Party Studies Ego Pillar Type Company Agent Bench 111! Takeshi Nara (Figure 1 (G) (b) Figure 1 (C) (d) Figure 3 1.n Figure 5 procedural amendment (voluntary) 1981! Hitomi Title of invention of patent application No. 141954 2° Lens holding device 3, relationship with the case of the person making the correction Takekei Applicant 11f/7 Tokyo Ite (143 Hatagaya 2-chome, Hagaya-ku, Tokyo)
Number 2 Shiji Name (Name) (037) Orinbanu optical co. Flange 3
1 trace correction. Catalog of documents rated 9

Claims (1)

Scope of Claims: (1) A lens holding device 6 that fixes a lens housed in a bell frame by pressing n, which includes means for absorbing dimensional changes in the radial direction of the lens, and the lens frame housing the lens. C,′! It is constructed by providing a means for rotating the frame in the optical axis direction and correcting the focal position due to the temperature of the lens Yx /I'jri'':'<
(2) The means for absorbing dimensional changes in the radial direction of the lens is a hollow duplex formed of a material with large elastic deformation 9'' mounted on the outer periphery of the lens. Deformation absorption B
11. Provide B material and Dv,'. The lens holding device described in item 1 of the scope of the requirements. (3) Means for absorbing dimensional changes in the radial direction of the lens E: A deformation absorbing member consisting of an annular body made of a material having a large amount of elastic deformation and interposed between the outer periphery of the lens and the joint between the lenses of the lens frame. A lens holding device according to claim 1, comprising: (4) The means for absorbing dimensional changes in the radial direction of the lens is provided with a deformation absorbing portion consisting of a deformation absorbing flange portion protruding inside the lens fitting portion of the endoscope frame housing the lens 7. A lens holding device according to claim 1. +51 The means for absorbing dimensional changes in the radial direction of the lens consists of both front and rear friction washers interposed between the inner lens netting part and the outer peripheral edge of the lens, and between the presser foot and the outer peripheral edge of the lens.9i, ii+ (61) The means for absorbing dimensional changes in the radial direction of the lens may include rubber provided on the lens suppressing surface of the holding area, or other ``1llt material. (7) The means for absorbing the radial dimensional change of the lens σ is a foam layer provided on the outer periphery of the lens for absorbing lens deformation. (8) The means for absorbing the dimensional change in the radial direction σ of the lens is provided in the lens barrel (; J i'll!) of the inner lens frame. T-shaped bullet 11.Special feature consisting of a deformed holding part and a ring-shaped W''11 gear i'14F4 damping part interposed between the elastic shaped holding part and the lens. '- lens holding device. (9) The means for absorbing lI'+h in the radial direction of the lens is to move a protrusion 1τ13 protruding from the outer periphery of the lens between the suppressing surfaces ( .theta.) Lens holding device as described in claim 1. 00) The means for accommodating the radial dimensional change "cl)" of the lens is the inner bell frame σ] lens barrel 1) rX
ls iτ The lens holding device according to the scope of the patent R1''j, which is interposed between the outer periphery 13 of the lens and the missing protrusion. , I (3
11 consisting of a thin walled portion having a ζ joint portion h'1.Lens retainer j:,,y according to claim 1. α) Lens frame housing the lens σ) While rotating the inner frame in the optical axis direction, the focal position V due to temperature change of the lens? J The means for correcting the misalignment is to fit the inner bell frame housing and holding the lens into the threaded portions VC9 (inner circumference σ) of the frame j, and to insert temperature sleeves into the fitting grooves provided on the inner periphery of the lens frame and the outer periphery of the inner lens frame. I1
Fit the rotary ring for 1, and connect the outer and inner circumferential parts of this rotary ring with bimetal (7'J).
The shape-changing force of the bimetal is used as a power source to rotate the inner scope frame via the inner peripheral part of the rotating ring, and the inner C3 is rotated.
By moving the frame in the direction of the light l'1T111, the air distance between the lenses in the lens system in the lens frame can be changed, and the focal position caused by the temperature change of the lens can be corrected. A lens holding device according to claim 1, comprising: