JPS5931912A - Lens holder - Google Patents

Abstract

PURPOSE:To absorb the radial thermal stress of a plastic lens due to temperature variation and to prevent variation in the radius of curvature of the lens, by fitting a deformation absorbing sleeve fixedly in the plastic lens installed in a lens frame. CONSTITUTION:When the temperature of the plastic lens body 40 held in the lens frame 30 of a lens holder is varied, the plastic lens body 40 expands and contracts according to repetitive cooling and heating operation and the thermal stress generated radially is absorbed by the elastic deformation of the deformation absorbing part 34 of the lens frame 30 and the flange part 61 of the deformation absorbing sleeve 60, preventing the variation in the radius of curvature of the plastic lens body 40. Therefore, when the plastic lens body 40 is installed in the lens frame 30, the need to specially increase the clearance to the lens frame 30 including the clearance of the fitting to the deformation absorbing sleeve 60 is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a special lens holding device fV1 that holds a lens within a lens frame.
In particular, we provide a lens system that maintains lens performance by fixing a Plus Deck lens, which has poor temperature resistance, in a lens frame so that its shape does not change due to temperature changes, and has strong humidity resistance. The objective is to expand the usage humidity range of plastic lenses and other lenses that are not temperature resistant. Conventionally, when preparing a lens, such as a plastic lens 7, in a lens frame 2, a cotton 1 As shown in Figure a, a plastic lens γ * [M
Fit the plastic lens 1 to the lens frame fitting part 5 while abutting the outer periphery 7a, and press the inner circumference of the frame 2 to the threaded part 3 of the frame 2 and press it around the ring 1. screwed into
Screw together the threaded part 6 and screw in the inner side C of the frame 2 and the second presser ring 1.
- Press the contact edge 1a with the Jl-prepared plastic lens 7 to the outer peripheral edge 7b on the front side of the plastic lens 7,
By fixing the plastic lens 7 in the sharp frame 2, t, j, +1 are formed.

Now, after assembling the plastic lens γ having the above configuration to the lens frame 2 using a conventional product, if the plastic lens γ is placed in a high-temperature atmosphere, the molding of the plastic lens 7 y 4.1 Since the coefficient of linear expansion of
The clearance of the lens plug frame fitting portion 5 becomes smaller.

Furthermore, this effect is most noticeable (J is shown in FIG. 1a at the contact portion 8 (119
In the enlarged view 1v shown in 1b, see 1), the relevant part is a file at room temperature, and the clearance is zero at the time of silking.
The difference in linear expansion coefficient of the molding material in the lens 7 presser 1 will affect the contact surface J1 by 4'.

That is, at the abutting portion 8 between the lens 7 and the presser foot 1, the outer peripheral edge γb on the front side of the lens 7, which is in pressure contact with the abutment edge 1a of the presser ring 1, is depressed, and due to the abutment edge 1a of the presser foot 1, N + / lens γ is regulated to zero clearance.

Therefore, as the temperature reaches room temperature, the plastic lens 7 begins to expand in the radial direction, but the restriction by the presser foot 1 restricts the deformation of the plus deck lens γ in the radial direction. The Shins 7
Thermal stress is generated internally.

As a result, the thermal stress generated inside the plastic lens 7 is restricted, which causes the plastic lens γ to become deformed in the optical axis direction.

Considering the cross section in the axial direction including the y (axis) of the plastic lens γ, it can be seen that in Figure 1 CI, the length of the mouth chord AB is 1
Since it is regulated by , it becomes smaller.

○ Now, the arc length of '
If the coefficient of linear expansion of the lens 7 is α, then r), r) A”E’〒AB・(1+αt), second approximation 4.

On the other hand, when the plastic lens 7 and lens frame 2 assembled together at room temperature are exposed to a low-temperature atmosphere, as mentioned above, the linear expansion coefficient σ) of the molding material of the plastic lens I, lens frame 2, and presser ring 1 changes. Due to this, as the temperature decreases, the folds, frame 2 and presser ring 1σ) shrink;
1 Il, V group or more contract, , t: try to shrink, but this 14. In addition, the outer peripheral edge 7b on the front side of the plastic lens T is fixed by pressure contact of the contact edge 11L of the presser foot 1.
As a result, as in the case of the above-mentioned high temperature, the I (Y shrinkage of the plus lens I is due to the contraction of the presser ring 1).
As a result, thermal stress is generated inside the plastic lens 7, and this thermal stress moves toward the optical axis of the plastic lens 7, which is not restricted by the presser 1. i! '+11 This results in a deformation in the direction.

Therefore, when considering the cross section of the plastic lens γ in the axial direction including the optical axis shown in FIG.

〇- T'c low? If the length of the arc at la time is AB, and the coefficient of linear expansion of the molding material of the plastic lens 7 is α, then r\,n A′B=;=AB·(1−αt) is approximated.

Therefore, from the above, the plastic lens 7 is mounted in the conventionally constructed 4j74i, 7 using the presser foot 1.
When f, the plastic lens 7 becomes 7^4I('' due to the change in curvature half (%).It is clear that it is small at high temperature and becomes weak at low AA.
): It can be seen that compared to the dry period, Bintoi~'1lilj has decreased significantly, and each of the differences has worsened by 8.14''.

- Also, in the conventional lens and the four-frame h' solution 2, as shown in FIG. 2
1.22 and interposing the alignment 1'1l (4th lens 24) between both lenses 21.22, the two lenses 21.22 adjacent to each other by the peripheral edge
Both lenses 2
In 1.22 years, a composite lens made of H.^ was developed to prevent the misalignment of the lens between 1JJ and 1JJ.
5-1386 r) It is proposed by the invention of Publication No. 6.

However, in the case of the H configuration, two lenses 21.2
By simply reducing the friction between the lens 21, :>2
The structure in which the lenses 21 and 224 are fixed in the fitting part 26 by the retainer 25 has no change in the capillary structure compared to the conventional structure.
t, its outer diameter is regulated by the fitting part 26 of the lens holding member 23 or the inner diameter of the presser foot 25; It is impossible to prevent such changes, and it is impossible to avoid a shift of 11° in focus position due to temperature changes and worsening of aberrations.

Therefore, in the conventional lens mounting structure 7 for a lens frame, a lens holding structure that prevents changes in the radius of curvature caused by temperature changes and that does not cause focus position deviation or worsening of Gj@species aberration, or other lens holding structures. There was a strong need for the development of appropriate countermeasures.

Therefore, the present invention proposes a lens holding device that eliminates the drawbacks of the conventional lens holding device described above and meets the above-mentioned demands. Examples of each lens protection F!i device will be explained in detail.

No. 2114 is the first lens of the present invention 1 (1 equipped (6)
A cloth example is shown, and a mirror replacement molded from 3011 synthetic resin as acid 1 engraving material is used.In this 65 frame 3 [1, a screw portion 31 for screwing the presser ring 50 is inserted 11 times, and a plastic glue lens is used. f book 40 Lens River i (=J PI; 3
2 ii' 1. ``tFurthermore, as an elastic part, deformation I as 5
Il&accommodating sleeve 60σ) On the inner periphery of the fitting portion 33, there is integrally formed a section-shaped absorbing portion 34 as a thin 11? wall that holds the sleeve 60.

Incidentally, the actual Mlj example 'C of the second bU a N 1) is the lens 11. Q j1 part 32 and modification III, the housing part 34 is constructed by intermittently protruding at three places in the circumferential direction of the lens frame 30, but in both cases this is It is also possible to provide a continuous projection on the inner periphery.

The flange part 61 of the thin plate structure is placed inside the flange part 61 of the frame 30, which is stored in the fitting part 33 as a storage part of the frame 30. Frame event department 6
2. The crotch is made of synthetic resin and the body is formed 1.

Further, on the inner periphery of the flange portion 61 of the deformation absorbing sleeve 60, there is a lens fitting portion 63 having an inner diameter corresponding to the outer diameter of the plastic lens body 40.

The flange portion 61 of the deformation absorbing sleeve 60 has an annular lens frame fitting portion 52 .
It is also possible to implement this by dividing it and providing it intermittently (not shown).

Now, when fixing the plastic lens body 40 within the lens frame 30 having the above-mentioned configuration, first, the plastic lens body 40 is attached to the lens fitting portion provided on the inner periphery of the flange portion 61 of the deformation absorbing sleeve 60. By fitting the plastic lens body 40 into a thin 197f wall that protrudes from the inner periphery of the sleeve 60, the plastic lens body 40 becomes a thin 197f wall that protrudes from the inner periphery of the sleeve 60. When supporting, both ti R'211 and sleeve 60
Plastic lens body 404 fitted to the lens l1i1d of the deaf frame 30 (・I l'1l Fits into the fitting part 33 of () and protrudes from the inner periphery of the deformation absorbing sleeve 6 [1 and the whale frame 31] L7
Thin-walled modified presser foot 11 (after being supported by the 4-receiving part 34, presser foot 4'+ fitted with φ16 screw part 31 of f'3 frame 30)
A one-piece plastic lens body 404 is fixed to the 'j 5Q.

However, from this configuration, Jj+7. When the plastic lens body 40 held in the frame 30 of the lens holding device 1 is subjected to thirst shielding, the plastic lens body A OGJ expands and contracts 1-, as a result of its cooling and heating changes. Thermal stress generated in the radial direction is e9 frame 30.
The change in the radius of curvature of the plastic lens body 40 is stopped by the elastic deformation of the 11M portion 34 and the flange portion 61 of the deformation absorbing sleeve 60.

Therefore, when the plastic lens body 40 is housed in the lens frame 30, there is no need to particularly increase the clearance with the lens frame 30, including the clearance for deformation 11 and fitting with the storage sleeve 60, and the conventional M' Takaraga iiJ 11. '
Therefore, the lens performance can be maintained at the same level as before.

In order to absorb one thermal stress in the radial direction, the deformation jl
+, 5 receiving part 34 and flange part 6 of deformation absorbing sleeve 60
Since the function is achieved by elastic deformation of
In addition, the compatibility of the plastic lens housing 40 can be applied to the film to achieve the intended purpose. On the other hand, it is possible to improve the moldability and assembly accuracy while adding approximately 7.i.

FIG. 3 shows a second embodiment of the lens holding device according to the present invention, and unlike the 8'51iJ812 example, the lens frame 30 is provided with an annular lens barrel attachment portion 35 on the inner periphery; No. 1 around
The structure 1 is the same as the first embodiment except that the deformation absorbing portion 34 is not provided.

In addition, the deformation absorbing sleeve 60 is
The structure was constructed by protruding the flange part 61 inside the annular lens frame fitting part 62, but instead of this, by protruding the flange part 61 on the outer periphery of the current lens fitting part 63, it can be integrated. J1 mo J, iu shi.

The inner diameter of the lens fitting portion 63 is the same as the modification 1M, z' provided on the outer periphery of the plastic lens body 40.
IV, the outer diameter of the fitting part 42 of the sleeve 60 and the outer diameter G- of the flange part 61 correspond to the inner diameter of the fitting part 33 of the housing sleeve 60, respectively. It is formed by tightening it.

Further, on the outer periphery of the plastic lens body 40, a lens deformation absorbing part 41 is provided protrudingly made of a thinner plate thickness than one bow of the main body 40. ++Q absorption sleeve 6'] fitting f?li 42 to n(n), these are integrated with the plastic lens body 40 to form a self-transforming +1'(1, - lens 43). Configure.

Then, the lens fitting part 63 of the deformation absorbing sleeve 60 is fitted into the circumferential fitting part 42 of the self-deforming +1AG 11M lens 43, and the self-lid type 11'!:, the collecting lens 4
After removing the sleeve 60 from the lens frame 3, the deformation absorbing sleeve 60 is fitted into the fitting part 33 of the lens frame 3, and the self-transforming sleeve 60 is inserted into the lens barrel. After dropping the attaching part 35, it is fitted onto the threaded part 31 of the lens frame 30 and fixed with the presser foot 50.

Therefore, in such a lens holding device, the plastic lens body 40 self-deforms p +L! Supported by the lens deformation absorbing section 41 provided in the lens 43;1. Metamorphic 11V,
The sleeve 60 itself is supported within the Sakai frame 30 by the flange portion 61 provided therein, and as in the first examples h and b, thermal stress in the radial direction due to temperature change occurring in the plastic lens body 40 is is the lens multi-piece absorption section 4
IJ! due to the elastic deformation of the 1st and 7th rungs 61! Total 11V
, it is possible to prevent the curvature 31' diameter of the plus deck lens body 40 from becoming a square.

Next, the third part of the 41st IC51 lens holding device of the present invention
4Jζ example is shown 1, →・y frame 30 and multi) 71 hair 1
The configuration of the 1ξ storage sleeve 60, second shot 1! It has the same configuration as the frfii example, but the self-hooked shape 11! 4 The lens % of the converging lens 43 and the shape II'! ! The foamed layer 44 of the lens 43 is made of a foamed layer 44, which changes the structure formed by the foamed layer 44 to 1. Two lens anchors 45 are provided on the outer periphery of the lens body 40, and this lens anchor 45
A foam layer 44 is integrally formed around the plastic lens body 40 by foam molding.

The outer diameter of the foam layer 44 corresponds to the inner diameter of the lens fitting part 63 of the deformation absorbing sleeve IJ-Pro 0, and the foam layer 44 has a fitting part 42 with the sleeve 60. However, the second fruit I
As in the case of Ji, the deformation absorbing sleeve 60 is fitted onto the self-deforming absorbing lens 43, and the sleeve 60 is placed inside the frame 30. Thermal stress in the radial direction generated in the lens body 40 is absorbed by the elastic deformation of the foam layer 44 and the modified J cedar absorbing sleeve 600, thereby completely preventing changes in the radius of curvature of the plastic lens body 40.

The lens holding device of the present invention is composed of one or more components, including a lens frame, a plastic lens housed in the lens frame,
In a three-way structure with an elastic member inserted between the two, on the lens frame side, heat 1i6 in the radial direction due to thermal expansion of the plastic lens is absorbed by l + l, i
A deformation absorbing sleeve as an elastic member and a deformation absorbing sleeve as an elastic member and a deformation absorbing sleeve as an elastic member and a deformation absorbing sleeve as an elastic member and a deformation absorbing member as described above for absorbing thermal stress. The structure of fixing the deformation Ilψ1(V) and the sleeve in the plastic lens fitting part, which is installed in the lens fitting part and housed in the lens frame, prevents the thermal force 1'l'A in the radial direction of the plastic lens due to temperature changes. +11 & II
VL, prevents the radius of curvature of the lens from becoming fluffy.

1-7 Therefore, the shift of corner point position due to temperature change n(11
It is possible to prevent li4 aberrations and aberrations, and it is possible to expand the operating temperature range of plastic lenses.

In addition, the above modification 1: By dividing the absorption part, the contact area with the variable force absorbing sleeve and the cylinder lens can be reduced, making it easier to change the structure, and β1 It can promote the period effect.

Furthermore, mirror +'? Since the modified J1♂ absorbing part t(t), which absorbs thermal stress by 1 flash in both ' and the sleeve, is able to absorb 11ψ of thermal stress, the 5゛i beadiness rate of the aqueous phase of 1 is reduced. By combining them, you can select IJ or +[!/ from the material's -, and in combination with shape measures, it becomes easier to stack, and plastic lenses with a known structure can be used. (Main) The fitting clearance with the space frame can be used in a wide temperature range beyond normal temperature while maintaining the conventional setting.

In addition, when the deformation absorbing portion is provided on the outer periphery of the plastic lens, the aforementioned thermal stress is absorbed by the elastic deformation of the deformation absorbing portion of the plastic lens and the deformation absorbing portion of the deformable sleeve, so that the known method It can also be applied to ~χ frames having a structure, and it can also be applied to R frames formed from metal.

However, there is also a deformation 1 to be provided on the first rotation of the plastic lens.
When the medullary absorption part is made of a foam layer (11), when it is fitted and fixed inside the deformation absorbing sleeve, the elastic deformation of the foam layer causes it to adhere tightly to the inside of the hair style absorbing sleeve, preventing eccentricity with the lens frame and misalignment with the optical axis. In addition, the elastic deformation of the foam layer in the thrust direction prevents the stress relaxation phenomenon after being suppressed and fixed by the presser ring. A decrease in loosening torque can be prevented.

In particular, (^foam jφ1 d"' is ξ!', the combination of sleeve A'4 trade and foam V +; ('37) heat J + ('5y force IIA &It'/ Against me/i
Since each 43 + I N:i y and 4 - can be changed, the 4) quality of the frame and plastic lens is 1
-11 Regardless of whether the lens shape 1 is changed or not, the adjustment 81 for changes can be easily made.

[Brief explanation of drawings]

#t'S Figure 1 a-e shows a conventional lens holding device17
, Figure 1a is a side concave view, Figure 1b is an enlarged cross-sectional view of Figure 1a, Figure 11c, d is the special lens maintenance equipment of Figure 11, 1a F? :;
e is frs, all sectional views showing an embodiment different from Fig. 1 a, Figs. 2 to 4 show examples of fabrics of the first to third examples of the lens holding lung it, Fig. 2 a, b is a side sectional view of the first example;
Front sectional view, Fig. 2C is the positive σ11 diagram of the deformation absorbing sleeve, Fig. 3 aC1 is the cross section 1-n1 of the second embodiment, FIG. 4A is a front view of the absorption lens, FIG. 4A is a side sectional view of the third embodiment, and FIG. -Lens barrel attachment part 33・Full Q fitting part 34Φ...Deformation j ((Accommodating part 40...-Plastic lens body 41...-Lens deformation 1g!Accommodating part 42-Middle II fitting) Part 43...φ Self-deformation absorbing lens 44-@φ foam layer 45...φ lens anchor 50---pressing ring 60...ψ deformation absorbing sleeve 61-fist・7 rung part 62---lens frame fitting part 63---lens Fitting part patent issuer Olympus Optical Works 41 Co., Ltd.
Attorney Patent attorney Nara Bottom box diagram 1 (G) (b) Figure 1 (c) △ Snake (d) △ (C) 43 Figure 4 (b) 1.9

Claims (1)

[Claims] (1) Between the plastic lens body and the mirror frame pP, @
In a lens holding device in which an elastic member made of oil is inserted and the plastic lens body is fixed in the lens frame using a presser, the bullet 11 in the lens frame is inserted into the lens frame. The lens is supported by a thin barrier protruding from the periphery, and the plastic lens inside the elastic part is supported by a thin barrier protruding from the inner periphery of the elastic part. Lens protection i,lr device. (2) The thin-walled barrier is constructed by applying Ni continuously or intermittently to the inner periphery of the lens frame or the inner periphery of the elastic part f. The l/lens retaining device i't0 (3) is characterized in that the thin barrier is constructed by protruding from the inner periphery of the lens frame or the outer periphery of the plastic lens body to -f. Special #'F tt^ The lens holding device described in the first month of the desired range. (4) The thin-walled barrier is formed by an annular deformation absorbing sleeve formed separately from the lens frame and the plastic lens body. Lens protection special equipment fFf. (5) The thin barrier is constituted by a foam layer formed by foam molding process 1 on the outer periphery of the plastic lens body. lens holding device P'i,.