JPS5915911A - Lens holding device - Google Patents

Abstract

PURPOSE:To prevent a focusing movement of a lens system, which is caused by a temperature change, by holding a lens in a lens frame through a space adjusting frame formed by a base material whose coefficient of linear expansion is larger than that of a base material of the lens frame. CONSTITUTION:In the constitution for holding two pieces of lenses 40, 41 in a lens frame 30, the first lens 40 is fitted into a fitting part 31 of the lens frame 30 and is fixed by a holder ring 37, and the second lens 41 is fitted into a fitting part 52 of a space adjusting frame 50, is fixed by a holder ring 39, and is held by the lens frame 30 through the space adjusting frame 50. In case when the second lens 41 is constituted as a plastic lens and the lens system is put as it is in a higher temperature state than a normal temperature, a focusing movement tends to be generated in the lens system, but an air space (d) between the first lens 40 and the second lens 41 becomes small because the space adjusting frame 50 is formed by a base material whose coefficient of linear expansion is larger than that of a forming base material of the lens frame 30, and on the contrary, in case when the lens system is put as it is in a low temperature state, a space d' becomes large and the focusing movement is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lens holding device, and more particularly, it is an object of the present invention to provide a lens holding device that can prevent focus shifts of lens threads caused by temperature changes.

Conventionally, when a lens, for example, a plastic lens 7, is placed in an iron layer within a lens frame 2, the rear outer peripheral edge 7a of the plastic lens 7 is attached to the lens frame mounting portion 4 of the lens frame 2, as shown in FIG. 1aK. Fit the plastic lens 7 into the lens frame fitting part 5 while making contact, and screw the threaded part 6 threaded onto the outer periphery of the presser ring 1 into the lens frame threaded part 3 threaded onto the inner periphery of the lens frame 2. Screw the presser ring l into the inside of the lens frame 2 while aligning the holding ring 1, and align the abutting edge 1a with the plastic lens 7 formed on the inner peripheral edge of the presser station 1 to the front side of the plastic lens 7σ) outer peripheral edge 7
b, and the plastic lens 7 is fixed in the lens frame 2.

Now, if the assembly of the plastic lens 7 to the lens frame 2, which has a heating structure, is carried out at room temperature, if this is exposed to a high temperature environment, the linear expansion coefficient of the molding material of the plastic lens 7 will be determined. 2 and the presser foot becomes smaller.

Furthermore, the area most noticeably affected by this is the contact area 8 between the lens 7 and the presser ring 1 in Figure 1a (see the enlarged view shown in Figure 1); , the clearance is already zero, and in the high-temperature surrounding atmosphere, there is a difference in linear expansion coefficient of the molded materials in the lens 7 and the presser ring 1, which directly affects the surface shape. become.

That is, the lens 7 and the contact portion 8 of the presser foot 1 are heated to
As a result, the front outer peripheral edge 7b of the lens 7, which is in pressure contact with the contact edge 1a of the presser ring 1, is depressed, and the contact R1a of the presser ring 1 restricts the lens 7 to a state of zero clearance.

Once the temperature reaches the cylindrical portion, the plastic lens 7 begins to expand in the radial direction, but the deformation of the plastic lens 7 in the radial direction is restricted by the restriction by the presser ring 1. Thermal stress is generated inside the lens 7.

Thermal stress generated inside the plastic lens 7 is not regulated and concentrates on deformation in the optical axis direction.
The plastic lens 7 may be deformed in the direction of its original axis.
l;(ro.

Considering the cross section of the plastic lens 7 in the axial direction including the optical axis, since the length of the chord AB in FIG.
The radius of curvature becomes smaller.

Now, if the length of the arc at room temperature is AB, the length of the arc when the city temperature is t°C lower than room temperature is A'B', and the coefficient of linear expansion of the plastic lens 7 is α, then the following is approximated.

Conversely, when the plastic lens 7 and lens frame 2 assembled together at room temperature are exposed to a low VN atmosphere, as described in hIJ,
Due to the difference in the net expansion coefficient of the molded elements of the plastic lens 7, the lens frame 2, and the presser foot 1, as the temperature decreases, the temperature of the lens frame 2 increases.
The twin axes of the plastic lens 7 are large compared to the twin wheels of the presser mound 1, and the plastic lens 7 tends to contract more than the contraction of the lens frame 2 and the presser ring l, or in this case, the abutting edge 1a of the presser ring 1 is pressed against the plastic lens 7. As a result, the outer peripheral edge 7b on the front side of the plastic lens 7, which is fixed by Thermal stress is generated inside the plastic lens 7, and this thermal stress is concentrated in the direction of the base axis of the plastic lens 7, which is not regulated by the pressure salt l, and causes the base of the plastic lens 7 to become concentrated. This results in deformation in the axial direction.

Therefore, just before taking the axial cross-section including the original axis of the plastic lens 7 shown in Fig. death,
As a result, the radius of curvature becomes larger.

Now, the length of the arc at room temperature is AB, the length of the arc at t°C lower than normal temperature is A'H', and the net expansion coefficient of the molding material of the plastic lens 7 is approximated as α and 1. .

Therefore, for one or more reasons, when the plastic lens 7 is mounted in the lens frame 2 having a conventional structure with the presser ring l,
It is obvious that the radius of curvature of the plastic lens 7 changes due to temperature changes, that is, it becomes smaller due to crystal sludge and becomes larger at low temperatures, and it also causes the focus position to shift significantly and various aberrations to worsen compared to when it is at room temperature. It turns out that there is something.

In addition, in the configuration of the conventional lens and lens frame, the first
As shown in FIG. , a composite lens configured to reduce the frictional resistance between the two lenses 21 and 22 that are adjacent to each other by their outer peripheral edges, and to prevent misalignment of the lenses between both lenses 21 and 22. This is proposed based on the invention disclosed in Japanese Patent Publication No. 55-138606.

However, in the case of this structure, the friction between the two lenses 21° 22 is only reduced, and the structure in which the lenses 21° 22 are fixed in the fitting part 26 by the presser ring 25 does not change in any way from the conventional structure. Instead, the lenses 21 and 22 have their outer diameters fixed to the fitting part 26 of the lens holding member 23 or the holding ring 25.
As with the plastic lens 7, it is impossible to prevent changes in the radius of curvature of both lenses 21 and 22 due to temperature changes. Things to do% O
It is J-Noh.

In the past, the above-mentioned conventional lens σ) mounting configuration for the lens frame prevents the change in the radius of curvature that occurs by 1" due to temperature changes at °C, causing focus position deviation and deterioration of ridge aberration. The development of a σ) (lens holding σ) configuration or other appropriate countermeasures was desperately needed.

Accordingly, one aspect of the present invention is to hold a lens to be held within a lens frame via a spacing adjustment frame, so that focus movement due to a change in the refractive index of the lens to be held can be controlled by expansion and contraction of the spacing adjustment frame. Other than the held lens held through the σ) lens, the focus shift due to the change in the shape of the plastic lens itself caused by the coefficient of linear expansion of the held lens is corrected by the change in the air distance between the lens and the held lens. There is a means for absorbing dimensional changes in the radial direction of the held lens (this can be corrected by intervening a means for reducing the frictional resistance f).
L. A lens holding device that can prevent the focus shift of the lens thread caused by temperature changes, and at the same time can expand the operating temperature range of the lens thread using a plastic lens. This is what I would like to suggest.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The lens holding device of the present invention will be specifically explained below along with the illustrated embodiments.

FIG. 2 is a partially omitted vertical sectional side view showing the first embodiment of the lens holding device of the present invention, in which two lenses 4 are placed in a lens frame 30.
This eliminates the case where 0.41 is maintained.

Now, the lens frame 30 is provided with a lens fitting part 31 for the lens 40, a first lens holding part s32 is provided in the front part of this fitting part 31, and a first lunz retainer s32 is provided in the rear part of the lens fitting part 31. A ring threaded portion 33 is provided.

Further, the lens frame 30 is provided with an interval adjustment frame 50σ) fitting 34 behind the lens fitting part 31 with a distance t14 at the rear of the fitting part 34. An abutment portion 35 and a presser ring screw portion 36 of the one-stage adjustment vertical frame 50 are provided.

The second lens fitting part 31 and the interval adjustment frame 50k
The inner diameter of the joint s 34 is made to correspond to the outer diameter of the first lune 40 and the first lunches fitting frame 50, and
The diameter of the frame 50 is formed to be 7" diameter from the housing of the lunse 40 so that the outer periphery of the lune 40 can be retained, and the abutment part 35 is fitted. The joining part 34σ) has a diameter larger than the inner diameter, and the edge 51 of the spacing adjustment frame 50 is provided with cinnamon f having a diameter larger than the diameter, and furthermore, the presser ring of the first lun's presser screw part 33 and the spacing adjustment frame 50 The threaded portion 36 is formed with an inner diameter corresponding to the outer diameter of the respective presser plates 37 and 38.

Furthermore, the interval adjustment frame 50 marked *i+ has an edge 51f at the rear end.
A fitting part 52 for the second lens 41 is provided in the front part of the circular body, and a second lens barrel part 53 is provided in the fitting part 52, and the inner periphery of the interval adjustment frame 50 is A second lens holding ring threaded portion 54 is provided, and the molding material of the lens frame 30 is made of! It is integrally formed with lT11 from a material with a coefficient of linear expansion greater than that of water.

In addition, the inner diameter of the fitting s52'' described in ^II is formed to be the outer diameter of the second lens 41, and the diameter of the second lens barrel support portion 53 is formed to be smaller than the diameter of the second lens 41. The inner diameter of the portion 54σ is larger than the inner frame of the second lens fitting 3B52, and has an inner diameter corresponding to the outer diameter of the holding ring 39 of the second lens 41.

In particular, the second lens 41 has an outer periphery of its main body 42.
This is achieved by providing a deformation absorbing portion 43 that is thinner than the minimum wall thickness of the main body 42 and by providing a lens abutting portion 44 on the outer periphery of the cedar absorbing portion 43.

Thus, y: The lens frame 3 (1') having the above configuration, the lens 4o is fitted into the lens fitting part 31, and the outer cylindrical edge of the lens 40 is locked to the lens body attachment part 32. death,
Attach the first lune retaining ring 37 to the first lun retaining ring threaded portion 33.
By doing so, the first lune 40 is fixed while being pressed against the round lun body fitting 32.

Further, the second lens 41 has a lens abutting portion 4 provided on the outer cylinder edge within the second lens fitting portion 52 of the interval adjustment frame 5o.
4 to the second lens barrel support part 53 while fitting the second lens retainer ring 39 to the second lens retainer ring threaded part 5.
4, the second lens 41f1 main body 42
The spacing adjustment frame 5 is
It is solidified in the second lens fitting part 52 of No. 0.

Furthermore, the interval adjustment frame 50 is the interval adjustment frame 50 of the mirror frame 30.
Insert the rear end of the cap 51 into the fitting part 34 of the abutting part 3.
By screwing the presser ring 38 into the presser ring threaded portion 36 while pressing the line portion 51 against the abutting portion 35, the interval adjustment frame 5o is inserted into the fitting portion 34. I'm going to have an okiya.

Of the second lens 4o and second lens 41σ) partially held within 3o as described above, now the second lens 41t-
When a lens system configured as a plastic lens is left at a temperature higher than room temperature, the lens thread held by the lens holding device will be affected by changes in the refractive index of the second lens 41 of the M lens system and changes in the curvature of the lens body 42. Try to shift the focus.

However, the spacing adjustment frame 50 that holds the second lens 41 has a coefficient of linear expansion larger than that of the molded material of the lens frame 3o. The grass spacing d (see Figure 2) becomes smaller, and on the other hand, it becomes larger if the plant is left in a low temperature state.

Also, the difference in the expansion of the gap adjustment frame 5o and the second lens 41 (・
The change in the radius of curvature of the second lens 41 due to the thermal stress caused by Substantial changes in the radius of curvature of 41 can be prevented.

Specifically, among the factors of the focus shift of the lens system caused by changes in the temperature atmosphere in which the lens holding wheel is imitated,
The material factor (change in refractive index) can be corrected by changing the air gap d between the first lens 40 and the second lens 41 due to the change in the length direction of the spacing and frame 50, and the shape factor (change in the lens body 42) The change in the radius of curvature) can be corrected by the deformation absorbing section 43.

In other words, the lens holding device configured as described above is used.
For example, a lens system including a plastic lens σ) can prevent focus shift due to temperature changes.

Note that in the above structure, the shape of the deformation absorbing portion 43 is not limited to the embodiment shown in the second figure, and a portion thinner than the minimum thickness of the lens body 42 may be provided on the outer periphery of the lens body 42. This includes any other possible configurations.

In addition, this deformation absorbing portion 43 is double molded on the lens body 42 using a molded material having an elastic modulus smaller than that of the molded material of the lens body 42.
It is also possible to implement this by providing a deformation absorbing portion 43 that passes through the R surface shape of the lens body 42 without making the thickness thinner than the minimum thickness 1 of the lens body 42.

Furthermore, when fitting the spacing adjustment frame 50 into the fitting portion 34 of the lens frame 3o, the fitting portion 3 of the spacing adjustment frame 5°
As a means to reduce the frictional resistance within 4, a low friction coefficient agent may be applied to the inner periphery of the fitting portion 34 in advance, or a double molding method may be applied to the contact portion between the mirror frame fitting portion 34 and the interval adjustment frame 50. By intervening a low friction coefficient agent, the spacing due to the temperature change can be maintained by intervening a low friction coefficient agent. A regular frame 50
The movement to the thrust force can be made smoother, and the desired effect of the interval adjustment frame 50 can be achieved as described above.

Next, FIG. 3 is a partially omitted vertical 9111 side view showing the @2 embodiment of the lens holding device of the present invention. second to
The structure for fixing the lens 41 is different.

1'', that is, in the case of the first embodiment, the lens body 4
However, in this embodiment,

As shown in the third figure, when fitting the second lens 41 to the low joint part 52 of the interval adjustment frame 5o, an annular shape is formed between the inner periphery of the low joint part 52 and the outer periphery of the second lens 41 using an elastic member. The elastic sleeve 45 is inserted at the presser station 39.
The second lens 41Yr is fixed while applying a pressure w of 4fl.

Therefore, the fitting portion 52 of the interval adjustment frame 50 and the second lens 4
The elastic sleeve 45 interposed between
In addition, it is possible to suppress thermal stress caused by the difference in the water rate between the space adjustment frame 50 and the interval adjustment frame 50.

However, as a result of being able to prevent the second lens 41 from changing its shape due to the action of the elastic sleeve 45, it is possible to prevent the second lens 41 from changing its shape. It is possible to obtain the same effect as
It is possible to prevent the focus of the lens system from shifting due to temperature changes.

Note that the configuration of the elastic sleeve 45 is not limited to the shape shown in the third figure at °C, but may have an appropriate shape that can be interposed between the fitting portion 52 and the outer periphery of the second lens 41, and the material thereof.
・The above-mentioned desired effect can be achieved using a suitably obtained detergent.

Further, in the configuration shown in the third figure, the same components as those in the first embodiment are given the same numbers, and the explanation thereof will be omitted.

FIG. 4 is a partially omitted vertical cross-sectional view showing a third embodiment of the lens holding device of the present invention.

In the case of an embodiment, in the configuration of the first embodiment, in particular,
When placing the second lens 41 into the fitting part 52 of the interval adjustment frame 50, the surface of the second lens body attachment part 53 and the second lens 41 are
An annular friction damping sheet 47 formed of a Teflon sheet or the like is interposed between the outer peripheral edge 41a of the second lens 41, and the outer peripheral edge 41a of the second lens 41 is pressed by the retainer ring 39 screwed onto the retainer ring threaded portion 54. The step part 48 is pressed and fixed, and the other configurations are the same as in the first embodiment, and the same numbers are given.
The explanation will be omitted.

By interposing the friction damping sheet 47, the lens body 42 can expand in the radial and leftward directions as the temperature changes, and the heat generated due to the difference in linear expansion coefficient between the inner part of the lens body 42 and the space adjustment frame 50 can be reduced. As a result of suppressing stress, it is possible to prevent the shape of the lens body 42 from changing due to temperature changes.

Therefore, in these embodiments, it is possible to prevent the focal shift of the lens system that would otherwise occur due to temperature changes, as in the embodiments described in No. 5111.

In this embodiment, the clearance between the outer diameter of the second lens 41 and the inner diameter of the fitting part 52 of the spacing adjustment frame 50 at room temperature is the maximum temperature in the expected operating temperature range of the lens system. There are two factors: the amount of focus movement of the lens system caused by the change in the shape of the second lens 41, or the necessary cost of setting the amount within the design tolerance.

Also, this clearance at normal temperature is not maintained in the second
It also changes depending on the shape factor of the lens 41 (・
It's a shame (・.

Figures 5a and 5t) are partially omitted vertical sectional side views showing a fourth embodiment of the present invention.

In addition, in the case of the fourth embodiment, instead of using the friction damping sheet 47 of the third embodiment, the lens barrel mounting portion 53 surface of the bellows frame 50 and the outer peripheral edge 41a surface of the second lens 41 are spaced apart. The structure is constructed by interposing absorbing protrusions 49 and 55 between them, and the other structure is the same as that of the 1.3 embodiment, so the same numbers are given and the explanation thereof will be omitted.

In other words, FIG.
Fig. 5 shows an example in which the absorbing protrusion 49 is protruded from the outer peripheral edge 4taVcr6 of the main body 42 of the second lens 41. It is.

However, in the case of the fourth practical example in which the friction reduction sheet 47 in the third embodiment is
, 55, it is possible to obtain the same effects as the other embodiments as well as the other configurations described above.

Note that the shapes of the absorption protrusions 49 and 55 are not limited to the shapes shown in the drawings, and the same applies to other W configurations such as their arrangement and number, and the positioning of the second lens 41 If there is no extreme deviation, it can be carried out in a particularly limited manner.

FIG. 6 shows a fifth embodiment of the lens holding device of the present invention, and in particular, a frame front portion 56 including a second lens fitting portion 52 and a second lens body attaching portion 53 of the interval adjustment frame 50 in the third practical example. The friction damping sheet 47 in the third and fourth embodiments is obtained by molding using a material with a low coefficient of friction, for example, a Teflon-based material.
9 and 55 are not required, and the frictional resistance between the second lens 41 and the second lens body mounting portion 53 can be reduced.

Also, contrary to the configuration of the frame front portion 56, the second side: /X4
It is also possible to implement this method by constructing the contact portion with the lens body mounting portion 53 outside the effective diameter of the lens 1 from a material with a low coefficient of friction.
The other configurations (*) are the same as those of the m3 actual example, so the same reference numerals are given and explanations thereof are omitted, and the effects are obtained in the same manner, so specific explanations will be omitted.

FIG. 7 shows a sixth embodiment, and when pressing and fixing the second lens 41 in the frame 50 with an interval of 1% by using a presser ring 39, a plurality of radially deformed beams 57 and thrusters shown in FIG. A deformation-absorbing beam frame 59 including a beam 58 is interposed and fixed, and the other configurations are the same as those of the first embodiment, so the same numbers are given to each, and the explanation thereof will be omitted.

However, the deformation absorbing beam frame 59 will be explained in detail in FIG.
7 and a thrust beam 58 that can be elastically deformed in the thrust direction.
They are integrally formed by protruding from each other at different angles.

However, when the second lens 41 is
2, after interposing the deformation absorbing beam frame 59 between the outer periphery of the second lens 41 and the inner part of the fitting part 52, hold down the main body 59a of the deformation absorbing beam frame 59 and hold the ring screw part 54. The second lens 41 is held within the lower fitting portion 52 while being pressed by a presser ring 39 screwed onto the second lens 41 .

Therefore, in this structure, the change in the outer diameter of the second lens 41 due to temperature change can be absorbed by the elastic deformation of the radial deformation beam 57, and the thickness change can be absorbed by the elastic deformation of the thrust beam 58. As a result, it is possible to suppress the thermal stress generated in the second lens 41 due to the difference in water swelling rate between the second lens 41 and the spacing adjustment frame 50, and to prevent the lens body 42 from changing its shape.

It goes without saying that with other configurations, the same desired effects as in each of the above embodiments can be obtained.

In addition, regarding the structure of the deformation absorbing beam frame 59 in Fig. 7,
The structure is not limited to the one shown in the figure, but the shape, number, arrangement, etc. of the radial deformation beam 57 and thrust beam 58 should be such that changes in shape due to temperature changes are evenly absorbed with respect to the optical axis. It can be implemented while taking care to ensure that

Next, FIG. 8 shows a seventh embodiment of the lens holding device of the present invention. It is constructed by providing a beam 57 and a thrust beam 58.

The other configurations are the same as those of the sixth embodiment, and are shown with the same reference numerals.・I will explain.

In the case of the eighth embodiment, in the structure of the first embodiment, a deformation absorbing portion 60a corresponding to the deformation absorbing portion 43 and the lens abutting portion 44 integrally formed on the outer periphery of the main body 42 of the second lens 41 is added. , and a deformation absorbing sleeve 60 having a lens abutting portion 60b is interposed between the inner periphery of the fitting portion 52 of the interval adjustment frame 50 and the outer periphery of the second lens 41, and the lens body 4
While positioning the second lens 41 in the radial direction, the second lens 41
is directly suppressed and fixed by the presser ring 39 screwed onto the presser ring threaded portion 54. Therefore, in addition to obtaining the same effect as the first embodiment with the deformation absorbing sleeve 60, , compared to the case where it is formed integrally with the second lens 41, in the case of this embodiment, the deformation absorbing sleeve 60 is formed separately.
The material for forming the second lens 41 can be freely selected without being restricted by the material for forming the second lens 41. For example, by selecting a material having an elastic modulus smaller than that of the material for the lens body 42, By forming the deformation absorbing sleeve 60, the deformation of the deformation absorbing sleeve 60 can be achieved more smoothly, and the deformation absorbing effect can be further improved.

Note that the shape of the deformation absorbing sleeve 60 is not limited to that shown in FIG. This can be implemented with an appropriate configuration.

Moreover, FIG. 10 shows a ninth embodiment, in particular, the second lens 41 of the first embodiment is provided with a protruding structure on the inner periphery of the second lens fitting portion 52 and on the outer periphery of the main body 42 of the second lens 41 of the first embodiment. A frame deformation absorbing portion 61 corresponding to the deformation absorbing portion 43 is integrally provided, and when the second lens 41 is fitted into the fitting portion 52, the frame deformation absorbing portion 61 is configured to While performing the positioning, the outer circumference M41 of the second lens 41
One surface of (a) is locked to the lens barrel attachment part 53, and the other (g) stepped part 48 is directly pressed and fixed by a retainer ring 39 screwed into the retainer ring threaded part 54.

Therefore, the same effect as the deformation absorbing part 43 of the first embodiment can be obtained by the frame deformation absorbing part 61, and the desired effect of the present invention can be obtained by using the other same structure.

Further, it is also possible to mold only the frame deformation absorbing portion 61 with a different type of material, and it is possible to expect the same effects as in the eighth embodiment.

FIG. 11 shows a tenth embodiment of the lens holding device of the present invention, in which a lens anchor 63 is provided protrudingly on the outer periphery of the main body 42 of the second lens 41 in place of the deformation absorbing portion 43 in the first embodiment. 63, a lens foam layer 65 is attached to the outer periphery of the lens skin layer 64, and when fitting the second lens 41 to the fitting part 52 of the spacing adjustment frame 50, the lens foam layer 65 is This lens foam layer 65 is interposed between the portion 52 and the outer periphery of the second lens 41.
The second lens 41 is held within the fitting portion 52 by pressing with a retaining ring 39 screwed onto the retaining ring screw s54.

In addition, the lens skin layer 64 is covered with a lens 65.
In addition to the case where it is an annular body covering the entire outer periphery of the lens body 42, the lens foam 116 in the shape of ~■ shown in Fig. 11 is used.
A columnar body consisting of 5? At intervals (
・It is also possible to construct and implement it by protruding it.

Further, regarding the structure of the deformation absorbing portion 60a and the frame deformation absorbing portion 61 in the eighth and ninth central portion examples shown in the ninth and tenth figures, the force (force) not specifically described. This force 1 is similar to this force 1. -I get it.

Now, what about the embodiment shown in FIG. 11 σ) Other than the structure of the lens foam layer 65? They are tl and 1st person, and the same number is attached, and the explanation is omitted.

Therefore, changes in the outer shape of the second lens 41 due to temperature changes in the same structure 1cJ6 are absorbed by the lens foam layer 65.
'4-A old rice that can prevent the occurrence of thermal stress in the lens body 42 can achieve the desired function and effect as well as the other configurations described above.

FIG. 12 shows the eleventh embodiment of the lens holding device of the present invention, that is, the fitting part 34 of the frame 50 for adjusting the distance aI of the lens frame 3o is made larger in diameter, and is formed of a cylindrical body with an edge 51 at the rear end. Between 1IlO1 and buttock frame 50.

A cylindrical spacer with an edge 51 omitted and an inner frame 70 having the same structure, and an inner diameter larger than the outer diameter of the inner frame 70, and an edge 72 at the rear end. It is constructed by connecting the adjustment inner frame 71 with a connecting arm 73 made of a J-shaped material with a coefficient of linear expansion.

Also, the diameter of the presser ring 38 and the presser ring threaded capital 36 (・
111] The diameter is increased in accordance with the diameter of the distance adjustment outer frame 71, but other configurations (111)
Since it is the same as the embodiment, the same number is given and the explanation thereof will be omitted.

However, the il lens 40. The silk 2 lens 41 is held in the same manner as in the first embodiment, and the inner frame 7o and the outer frame 71 are fitted into the fitting part 34 of the lens frame 3o, and then fitted into the retaining ring screw part 36. The presser ring 38 is screwed together, and the edge 72 of the outer frame 71 for adjusting the distance hq that has been applied to the abutment part 35 is held by the presser ring 38.
Fix it while suppressing it.

Therefore, according to this embodiment, the function and effect of the V% adjustment frame 50 itself during the first embodiment are changed to the interval V<=inner frame 7° and the outer frame 71, respectively, and the connection between the two. Connecting arm 73
It can be exerted by its action and effect.

The amount of change in the air gap d between the second lens 41 and the second lens 41 due to temperature changes is approximately twice that of the first embodiment, even if the lengths of the gap adjustment inner frame and outer frame are the same l. However, theoretically, the structure of the spacing a14 crab frame 50 in the first disaster example is based on the above example, and 3. &, By adopting the multi-M configuration of the four emperors, it is possible to increase the amount of change in the air distance d by three or four times or more.

Note that the linear expansion coefficient of the MiJ connecting arm 73 is required to be much smaller than the linear expansion coefficient of the interval adjustment inner frame 7o and the outer frame 71.

In addition, this embodiment shows an example applied to the first embodiment shown in FIG. 12 (in particular, the second embodiment shown in FIG. By replacing the frame 50 with an interval adjusting inner frame 7o and an outer frame 71 connected by a connecting arm 73, it can be applied to the second to 1o embodiments.

However, their specific explanation and illustration will be omitted.

FIG. 13 shows a twelfth embodiment of the main party's lens holding device, and in particular, 1! in the first embodiment shown in the second figure! It is constructed by providing an annular clearance adjustment beam 74 on the edge 51 of the IJ leg adjustment frame 50, and the edge 51 is abutted against the abutment part 35 of the lens frame 30, and the leg alignment beam 7Δ is fully fitted. It comes into contact with the inner peripheral surface of 34.

It is constructed by pressing the spacing-adjusting frame 50 into the fitting portion 34 of the lens frame 3o by a presser ring 38 screwed onto the presser ring threaded capital 36.

Therefore, the material for the space adjustment frame 5o should be purchased with a linear expansion coefficient of ℃・
It is necessary to form it while selecting the thing, and the design makes the mirror frame 30
This may result in insufficient clearance between the inner diameters of the fitting portions 34. Therefore.

In this case, the adjustment beam 7 provided on the upper edge 51 of the structure
It is possible to increase the degree of contact between the outer diameter of the spacer 4 and the inner diameter of the fitting part 34, and the deformation of the interval adjustment frame 50 itself in the radial direction can be absorbed by the deformation of the adjustment beam 74. As a result, unnatural deformation of the spaced all frame 50 can be prevented.

Note that the shape of the clearance adjustment beam 74 is not limited to the shape shown in FIG. This can be implemented by using a shape that can absorb the frame 50 without shifting or tilting.

In addition, the gap clearance pj, fi alignment beam 74 is an example of a means for absorbing changes in the radial direction of the interval adjustment frame 5oσ).
When fitting o into the fitting part 34.

A specific example can be mentioned in which an elastic advantage is interposed between the two.

Furthermore, this embodiment has been specifically explained in accordance with the embodiment applied to the first embodiment shown in FIG. This can be applied according to the embodiments.

As is clear from the above description, the lens holding device of the present invention is capable of holding a held lens, for example a plastic lens, within a lens frame through means for absorbing dimensional changes in the radial direction. By fixing it within the space adjustment frame made of a material with a coefficient of linear expansion larger than that of the frame, it is possible to prevent the focus of the lens system from shifting due to temperature changes. Use the lens (・
The temperature range in which the lens system can be used can be greatly expanded.

Below, the effects of the lens holding device 1 of the present invention will be explained first.
This will be explained more specifically by the table showing comparative data between the illustrated conventional device and the devices of the first and eleventh embodiments of the present invention.

Table I *The fins indicate the lids that shift the focus of each device due to temperature changes.

In addition, in the first embodiment, the focus movement i at a temperature of -20°C
It has been found that the reason why t+o, 03 +u could not be fully corrected was due to the fact that the length l of the interval adjustment frame 50 could not be taken sufficiently due to the basic frame structure.

[Brief explanation of drawings]

Figures 1a to 1e show the prior art; Figure 1a is a sectional view of a conventional lens holding device; Figure 1 is an enlarged view of the same part;
Figures 1c and d are explanatory diagrams showing changes in the shape of the lens due to temperature changes of the held lens in the device, and Figure 1e is a cross-sectional view of the lens holding device showing a different embodiment from Figure 1a. , FIGS. 2 to 13 show the first to twelfth embodiments of the lens holding device of the present invention, and FIGS. 2 to 7 and FIGS. 9 to 13 show the first to sixth embodiments and the eighth to twelfth embodiments. FIG. 8 is a longitudinal sectional side view of the seventh embodiment, with some parts omitted. 30...Mirror frame 31.52.0 1st. 2nd lens fitting part 32.53”・
・First. 2nd lens barrel attachment part 33, 36.54... Holding ring threaded part 34... Fitting part 350-- Abutting part 37, 38.39... 0 Holding ring 40.41... 1st. Second lens 421/Lens body 43...Deformation absorbing part 44/Φ/Abutting part 45...Elastic sleeve 47...@Friction damping sheet S 49/Φ absorbing protrusion 50...Spacing adjustment frame 51...-Edge 56...Frame front part 57...Radial deformation beam 5B-Fist/thrust beam 59...Deformation absorption beam frame 60...Deformation absorption sleeve 61/War/frame deformation absorption portion 65 ... Lens foaming part 70 ... Interval adjustment inner frame 71 ... Interval adjustment outer frame 74 ... Clearance adjustment beam Fig. 1 (a) (b) Fig. 1 (C) (d) Fig. 1 (e) Figure 2 Figure 3 Figure 5 ((1) Figure 6 Figure 7 ((1) (b) Figure 8 Figure 9 Figure 10 Figure 11 Figure 13 Procedural amendment (voluntary) 1975 Patent Application No. 125972 Title of the invention 2° Lens holding device 3, Relationship with the case of the person making the amendment Patent applicant (1. Address: 43-2, Hata'/' Li 2, 'J River', Shibuya-ku, Tokyo) Name (Name) (037) Shigeru Kitamura, President and Director of Olympus Optical Industries Co., Ltd. 4, Agent *lJ#J's grasp and drawings 8, Contents of amendment (1) Page 24, line 9 of the specification, Same page, line 1T,
The description of "thrust beam 58" in the 8th line of the 25th page, the 18th line of the same page, and the 5th and 6th lines of the 26th page is corrected to ``the thrust deformed beam 58'', respectively. (2) The statement on line 15 of member 27 of the specification is amended as follows. Equipped with a deformation absorbing portion 60aY (depending on the material of the K-shaped absorbing sleeve 60, the thickness of the deformation absorbing portion 60a may vary depending on the material of the K-shaped absorbing sleeve 60).
(2) Radius of the second lens 41 (not affected by the minimum wall thickness of 2)" (3) The description "58... Thrust beam" in the 8th line of page 37 of the specification W has been changed to "58... Thrust deformed beam. ” he corrected. (4) Among the drawings, FIG. 4, FIG. 5 a, b, FIG. 6, FIG. 8, FIG. 9, and FIG. 10 will be corrected as shown in the attached correction drawings. 9. List of attached documents (1) Amended drawings 1 copy Figure 5 (Q) (b) Figure 6 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] (1) As a means for absorbing dimensional changes in the radial direction of the lens to be held and a means for correcting focus movement in the thrust direction of the lens to be held, linear expansion larger than the coefficient of linear expansion of the lens frame material is used. A lens holding device comprising an interval adjustment frame made of a transparent material. (2) As a means for absorbing dimensional changes in the radial direction of the lens to be held and as a means for correcting focus movement in the thrust direction of the lens to be held, a material with a coefficient of linear expansion that is thicker than that of the lens frame material is used. A lens holding device comprising: an interval adjustment frame formed by 1 and a means for absorbing changes in the radial direction of P# adjustment during the interval adjustment frame. (3) The a! Is it larger than the expansion rate?
A space adjustment frame made of a material with an expansion coefficient of N, and this space I
A lens holding device comprising a means for reducing frictional resistance in the thrust direction of an A-adjustment frame. (4) As a means for absorbing dimensional changes in the radial direction of the lens to be held and as a means for correcting focus movement in the thrust direction of the lens to be held, the coefficient of expansion is larger than the coefficient of expansion of the lens frame material (・1
#A lens holding device comprising an outer frame and an inner frame for adjusting the interval made of an expandable material and connected by a connecting member made of a material with a low coefficient of linear expansion. (5) The means for absorbing dimensional changes in the radial direction of the lens to be held is provided with a deformation absorbing portion on the outer periphery of the lens body of the lens to be held, which is thinner than the minimum wall thickness of the lens to be held. The lens holding device according to range 1, 2 JJ, 3 or 4. (6) The means for absorbing dimensional changes in the radial direction of the lens to be held includes the inner periphery of the interval adjustment frame and the lens to be held (((
The lens holding device according to claim 1, 2, 3, or 4, wherein an elastic member is interposed between 7' and outer periphery 1i. (Force) The means for absorbing dimensional changes in the radial direction of the lens to be held is provided by interposing a friction resistance reducing sheet between the lens body mounting portion having the regular interval w4 and the lens to be held. Item, item 2. Lens holding device-0 as described in item 3 or 4. Or, a lens holding device described in paragraphs 1, 2, 3, or 4 of the patent, i**, in which a retaining portion of a lens to be held is provided with a missing absorbing protrusion. (9) The above-mentioned The means for absorbing dimensional changes in the radial direction of the lens to be held comprises forming the lens barrel support portion of the interval adjustment frame with a friction damping member.
The lens holding device according to item 3 or 4. (101 The means for absorbing dimensional changes in the radial direction of the lens to be held is formed by holding the lens through the sleeve provided with a beam deformable in the thrust and radial directions when holding the lens to be held in the space adjustment frame π. Claim 1
The lens holding device according to item 1, 2, 3, or 4. 01) The means for absorbing dimensional changes in the radial direction of the lens to be held is, when holding the lens to the interval adjustment frame, holding the lens through a presser ring having a beam deformable in the thrust and radial directions. Claim 1 consisting of:
Lens holding device according to the second, third and fourth paragraphs. 02) The means for absorbing dimensional changes in the radial direction of the lens to be held is a modification that includes a deformation absorbing part thinner than the minimum thickness of the lens to be held between the lens fitting part of the space BN4u frame and the lens to be held. The lens holding device according to claim 1, 2, 3, or 4, which comprises an absorbent sleeve. 03) The means for absorbing dimensional changes in the radial direction of the lens to be held is provided with a cylindrical absorbing part in the lens fitting part of the interval adjustment frame, which is smaller than the minimum thickness of the lens to be held. The lens holding device according to item 1, item 2, item 3, or item 4. α4) The means for absorbing dimensional changes in the radial direction of the lens to be held includes a foam member integrated with the outer periphery of the lens diameter of the lens to be held. A lens holding device according to claim 1, 2, 3, or 4, further comprising: 05) The lens holding device according to claim 2, wherein the means for absorbing the quality tube in the radial direction of the interval adjustment frame is provided with a clearance=m beam on the interval adjustment frame. 06) The lens holding device according to claim 2, wherein the means for completely absorbing the change in the radial direction of the distance adjustment frame comprises an elastic member interposed between the fitting portion of the lens frame and the distance adjustment frame. α7) The means for reducing the outdoor resistance of the space adjustment frame in the thrust direction is the V between the space adjustment frame fitting portion of the lens frame and the space adjustment frame.
cClaim 3rd tomb formed by interposing a friction damping agent dC
Includes a brass lens holder.