JPH08206951A - Holder of lens, zoom lens and camera - Google Patents

Abstract

PURPOSE: To reduce equipment cost, and enhance productivity by simplifying an equipment necessary for assembling work. CONSTITUTION: A first lens 12 is inserted into a first inserting part 15 of a lens holder 11, and a second lens 13 is inserted into a second inserting part 16. A thermally contractible tube 14 being a thermally deformable means is fitted to and inserted into the outer peripheral side of the second inserting part 16, and its thermally deformable part 23 is put on an outside end part 21 of the second lens 13. Therefore, since both end parts of the first lens 12 and the second lens 13 are locked on a locking part 17 of the lens holder 11 and the thermally contractible tube 14 fastened and fixed to the lens holder 11, these are stably held in a prescribed position. Since heating of the thermally contractible tube 14 can be performed by a general heating furnace or the like, equipment cost can be reduced. Since a large number of pieces can be simultaneously heated by batch processing, productivity can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens holding device capable of reducing production equipment costs and improving productivity, and a zoom lens and a camera using the same.

[0002]

2. Description of the Related Art Conventionally, for example, when a lens of a camera is attached to a lens holder, a heat caulking margin is provided at an end of a lens insertion portion of a lens holder formed of polycarbonate, for example, by heating and caulking it. The lens inserted in the lens insertion part was sometimes held.

[0003]

As described above, when the lens is held by thermal crimping, a dedicated machine for thermal crimping is required, which causes a problem of increase in production equipment cost.
In addition, since the shape and dimensions of the header of the dedicated heat crimping machine must be set according to the shape and dimensions of the heat crimping allowance of the lens holder, the header shape and dimensions must be changed every time the type of lens changes. However, there is a problem that the production equipment cost also increases.

In this case, the shape and dimensions of the heat crimping margin of the lens holder are set so as not to block the optical path diameter (effective diameter) which affects the heat crimping strength and the optical characteristics. Although the above condition settings are fed back to the molding die, the shape and dimensions of the thermal caulking allowance differ from the design values due to shrinkage during molding, so the shape and dimensions of the thermal caulking allowance must be determined by trial and error. There is also a problem that productivity is lowered. Further, since the heat crimping margin of the lens holder is comparatively small and thin, it becomes difficult for the molten resin to flow to the tip portion, so that a molding defect such as a so-called short mold is likely to occur, which also causes a decrease in productivity. Further, since the heat caulking work requires about 10 seconds per piece, there is a problem that productivity is further reduced.

Therefore, the present invention solves the above-mentioned problems, and a lens holding device capable of simplifying the production equipment, reducing the equipment cost, and further improving the productivity. , And propose a zoom lens and a camera using the same.

[0006]

In order to solve the above problems, in the lens holding device according to the first aspect of the present invention, the lens holder is provided with a thermal deformation means, and one end of the lens is locked to the lens holder. In addition, the other end of the lens is locked to a thermal deformation portion formed by heating of the thermal deformation means.

In the zoom lens according to claim 2,
A lens holder in which a lens holder is provided with thermal deformation means, one end portion of the lens is locked to the lens holder, and the other end portion of the lens is locked to a thermal deformation portion due to heating of the thermal deformation means. , Are provided.

In the camera of the third aspect, the lens holder is provided with a heat deforming means, one end of the lens is locked to the lens holder, and the other end of the lens is heated by the heat of the heat deforming means. The lens holding device is retained by the deformable portion.

[0009]

In the present invention, one end of the lens is locked to the lens holder. Further, the heat deforming means provided on the lens holder is heated and deformed toward the lens side, and the other end of the lens is locked to the heat deforming portion. As a result, both ends of the lens are locked by the lens holder, and the lens is held stably without displacement.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of a lens holding device, a Zlaem lens and a camera according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a lens holding device 1 according to the present invention.
FIG. The lens holding device 1 includes a lens holder 1 formed of a resin such as polycarbonate.
1 and the first lens 12 inserted in the lens holder 11
And a second lens 13 and a heat-shrinkable tube 14 which is a heat deforming means for locking the second lens 13.

The lens holder 11 is formed in a cylindrical shape, and has a first insertion portion 15 for inserting the first lens 12 and a second insertion portion 15.
The 2nd insertion part 16 for inserting the lens 13 is provided adjacently. Inner diameter of the first insertion part 15 and the second insertion part 1
The inner diameter of 6 has concentricity and circularity with a predetermined accuracy.
The inner diameter of the first insertion portion 15 is smaller than the inner diameter of the second insertion portion 16. A locking portion 17 is provided at the right end of the first insertion portion 15 in the drawing, and the first lens 12 is locked therein. The locking portion 17 is provided with a light passage hole (fixed diaphragm) 18 for passing light that has passed through the first lens 12 and the second lens 13. A taper 19 is provided at the end of the second insertion portion 16 of the lens holder 11. A flange 20 is provided at the boundary between the first insertion portion 15 and the second insertion portion 16.
Is provided.

The first lens 12 is the first lens of the lens holder 11.
The second lens 13 is inserted into the insertion portion 15 and the second lens 13 is inserted into the second insertion portion 1.
It is inserted in 6. The right end of the first lens 12 is locked to the locking portion 17, and the right end of the second lens 13 is locked to the left end of the first lens 12.
The left end 21 of the second lens 13 projects outward from the end surface 22 of the second insertion portion 16 of the lens holder 11.

The heat-shrinkable tube 14 is used for the lens holder 11
Is inserted into the outer periphery of the second insertion portion 16 of the with a predetermined tightening force,
The thermal deformation portion 23 covers the left end portion 21 of the second lens 13. As a result, the end portion 2 of the second lens 13
1 is a heat-shrinkable tube 14, and thus a lens holder 1
It is locked at 1. Here, the diameter of the tip 23A of the heat deformable portion 23 of the heat shrinkable tube 14 is set to be larger than the effective diameter A of the second lens 13.

That is, in this lens holding device 1, the right end of the first lens 12 is locked by the locking part 17 of the lens holder 11, and the right end of the second lens 13 is the left end of the first lens 12. Since the left end 21 of the second lens 13 is locked to the heat-shrinkable tube 14 attached to the lens holder 11,
Also, the second lens 13 can be stably held at a predetermined position without being displaced in the optical axis direction. Further, a taper 19 is provided at the tip of the lens holder 11,
Since the edge is removed from the portion where the heat-shrinkable tube 14 abuts, it is possible to prevent the heat-shrinkable tube 14 from being scratched and cut.

When assembling the lens holding device 1, as shown in FIG. 2, first, the heat-shrinkable tube 14 is inserted into the outer peripheral side of the second insertion portion 16 of the lens holder 11. At this time, the inner diameter D1 of the heat-shrinkable tube 14 and the second insertion portion 1
The dimensions of each part are set so that a predetermined gap is formed between the outer diameter D6 and the outer diameter D2. The shrinkage rate of the heat-shrinkable tube 14 is set so that the heat-shrinkable tube 14 is clamped and fixed to the lens holder 11 with a predetermined tightening force after the shrinkage is completed. Here, by appropriately setting the heat shrinkage rate of the heat shrinkable tube 14 and the gap between the heat shrinkable tube 14 and the lens holder 11, the tightening force (withdrawal force) of the heat shrinkable tube 14 can be arbitrarily set. it can.

The heat-shrinkable tube 14 is made of a material which is heat-shrinkable by a predetermined dimension at a heat-deformation temperature of the lens holder 11, which is lower than the heat-deformation temperature of 142 ° C. to 150 ° C. of polycarbonate, such as Sumitomo. Sumitube C (polyolefin), Sumitube F3 (polyolefin) and the like manufactured by Denki Kogyo KK can be selected. Sumitube C has a shrinkage start temperature of 60 ° C, a shrinkage completion temperature of 90 ° C, and a wall thickness of 0.2 to 0.3 m.
m. The Sumitube F3 has a shrinkage start temperature of 50 ° C, a shrinkage completion temperature of 90 ° C, and a wall thickness of 0.1 to 0.15. The thermal contraction rate of the Sumitubes C and F3 is about 45% when the contraction is completed.

If the heat-shrinkable tube 14 is thin, the second
Since the size of the lens 13 protruding outward is small,
For example, when a plurality of lenses are used in combination, such as a zoom lens, it is possible to reduce the distance from the lens in front of the zoom lens, and to shorten the overall length of the zoom lens.

Now, the second insertion portion 16 of the lens holder 11
After the heat-shrinkable tube 14 is inserted on the outer peripheral side, the first lens 12 is inserted into the first insertion portion 15, and then the second lens 13 is inserted into the second insertion portion 16. At this time, the first
The lens 12 and the second lens 13 are inserted in the first insertion portion 15 and the second insertion portion 16 so as not to rattle in the optical axis direction. This completes the temporary assembly of the lens holding device 1.

In the temporarily assembled lens holding device 1, the heat-shrinkable tube 14 is heated. This heat treatment is performed by, for example, as shown in FIG.
This is performed by placing a plurality of lens holding devices 1 on 1 and heat-treating them in a heating furnace 32. The mounting table 31 is provided with a round hole 33 to such an extent that when the first insertion portion 15 of the lens holder 11 is inserted, the flange 20 is locked and the lens holding device 1 is stably mounted. . As the heating temperature of the heating furnace 32, the lens holder 11
The temperature is lower than the heat deformation temperature of the above, and is higher than the shrinkage completion temperature of the heat shrinkable tube 14, for example, about 100 ° C ± 10 ° C. Here, by making it possible to mount a large number of lens holding devices 1 on the mounting table 31, it is possible to improve productivity. The lens holding device 1 can be applied to the zoom lens and various cameras as described above, and thereby the productivity of the zoom lens and the camera can be increased.

The heat treatment of the heat-shrinkable tube 14 is
As shown in FIG. 4, for example, the lens holding device 1 may be placed on a movable belt 41, and the heat-shrinkable tube 14 of each lens holding device 1 may be heated by a simple heater 42. . Such a simple heating device 42
For example, a heating gun manufactured by Hakuko Co., Ltd. can be selected. In addition, this heating gun has a maximum temperature of 45 mm at a position 10 mm away from the nozzle opening.
Since it is about 0 ° c, it is necessary to control the temperature so that the lens holder 11 does not undergo thermal deformation.

The lens holding device 1 according to the present invention heats the heat-shrinkable tube 14 to heat-shrink it in the general heating furnace 32 or the simple heater 42 as described above, whereby the inside of the lens holder 11 is heated. It holds the first lens 12 and the second lens 13, and does not require a dedicated machine for thermal caulking as in the prior art. Therefore, the production equipment can be simplified and the equipment cost can be reduced.

[0023]

As described above, according to the present invention, the lens holder is provided with the heat deforming means, one end of the lens is locked to the lens holder, and the other end of the lens is the heat deforming portion of the heat deforming means. It is locked to.

Therefore, according to the present invention, since the heat deforming means is heated and deformed by heat, and the lens is locked and held at the heat deforming portion, if there is a simple heating means during the assembling work. Well, since it does not require a dedicated machine for thermal caulking as in the past, it is possible to simplify the production equipment and reduce the production equipment cost. Further, since it is possible to heat-treat a large number of lens holding devices at the same time, it is possible to increase productivity.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a lens holding device 1 according to the present invention.

FIG. 2 is a diagram showing a temporary assembly procedure of the lens holding device 1.

FIG. 3 is a diagram showing a method of heating the heat-shrinkable tube 14.

FIG. 4 is a diagram showing another method for heating the heat-shrinkable tube 14.

[Explanation of symbols]

 1 Lens Holding Device 11 Lens Holder 12 First Lens 13 Second Lens 14 Heat Shrink Tube 15 First Insertion Part 16 Second Insertion Part 32 Heating Furnace 42 Heating Machine

Claims (6)

[Claims] 1. A lens holder is provided with thermal deformation means, one end of the lens is locked to the lens holder, and the other end of the lens is locked to the thermal deformation part of the thermal deformation means. A lens holding device characterized by: 2. A lens holder in which a heat deforming means is provided, one end of the lens is locked to the lens holder, and the other end of the lens is locked to a heat deforming portion of the heat deforming means. And a holding device for the zoom lens. 3. A lens holder is provided with a thermal deformation means, one end of the lens is locked to the lens holder, and the other end of the lens is locked to the thermal deformation part of the thermal deformation means. And a holding device for the camera. 4. The lens holding device according to claim 1, wherein the heat deforming means is a heat-shrinkable tube fitted to the outer peripheral side of the lens holder. 5. The zoom lens according to claim 2, wherein the heat deforming means is a heat-shrinkable tube fitted to the outer peripheral side of the lens holder. 6. The camera according to claim 3, wherein the heat deforming means is a heat-shrinkable tube fitted to the outer peripheral side of the lens holder.