JPH0637405Y2 - Camera charge capacitor mounting structure with built-in strobe device - Google Patents

Description

[Technical Field] The present invention relates to a structure in which a charge capacitor is mounted in a camera having a built-in strobe device, and more particularly to a structure in which the charge capacitor is mounted to a lens barrel.

"Prior art and its problems" In recent years, the automation of cameras has progressed, and in not only lens shutter cameras but also single-lens reflex cameras, automatic exposure control devices, automatic strobe devices, automatic hoisting, rewinding devices, automatic focus adjusting devices, and More and more are equipped with variable focal length lenses.

An automated camera like this (hereinafter "auto camera")
Has built-in motors for automatic hoisting, rewinding and autofocusing devices, light emitting parts and charge capacitors of automatic strobe devices, and batteries for driving these devices inside the camera body. . A battery that supplies energy to these is bulky because it needs to have a large capacity, but an AA, AAA battery or a so-called lithium pack battery is used. Therefore, this type of auto camera is heavier and larger than the conventional type of camera that does not have a built-in strobe device or the like.

However, even in such an auto camera, there is a strong demand for weight reduction and compactness.

In addition, consumers have a desire to obtain a compact camera with a wide stroboscopic shooting range. In order to meet the former requirement, the amount of light should be increased (the guide number should be increased), but for that purpose, the capacity of the charge capacitor must be increased, and the volume increases in proportion to the increase in capacity. Therefore, the camera body for accommodating the charge capacitor also becomes large, which violates the latter requirement.

In other words, in the structure where the charge capacitor is mounted inside the camera body, the charge capacitor has a large capacity (larger size).
Then, the camera body becomes large, and there is a problem that the amount of light becomes small if the charge capacitor is made small (reduced capacity) in order to make the camera body compact. Therefore, the conventional auto camera sacrifices one or both of compactness and strobe light emission amount.

"Object of the Invention" The present invention has been made based on the above-mentioned awareness, and provides a charge capacitor mounting structure which can make a camera body compact while securing a sufficient amount of light in a camera having a built-in strobe device. The purpose is to

"Outline of the Invention" This invention was made in view of the fact that there is almost no space in the camera body, but there is still usable space in the lens barrel. An arcuate or annular capacitor storage space is provided in the cylinder, and a charge capacitor for causing the strobe device to emit light is formed in an arcuate or annular shape that fits into this capacitor storage space and is stored in this capacitor storage space. Is fixed to a frame member constituting the lens barrel.

[Embodiment of the Invention] The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a perspective view showing an essential part of a lens shutter type camera to which the present invention is applied, and FIG. 2 is a longitudinal section of the same embodiment taken along a plane passing through an optical axis.
It is sectional drawing which showed the principal part of the upper half.

The camera to which the present invention is applied includes a zoom lens 11 fixed to the camera body 10 and a camera mounted inside the camera body 10.
A zoom motor (30) for zooming, a finder device (40) and a strobe device (50) are provided, and a charge condenser (60) for strobe emission is mounted in the zoom lens (11).

The zoom lens 11 is a cosmetic lens barrel 12 fixed to the camera body 10, and a cam lens barrel mounted in the cosmetic lens barrel 12 so as to be rotatable around the optical axis and not to move in the optical axis direction. 13
And an inner lens barrel 18 mounted inside the cam lens barrel 13 so as to be movable in the optical axis direction. Further, a gear 14 is provided on the outer periphery of the cam barrel 13.
Is fixed to the output shaft of the zoom motor 30 on the gear 14.
The pinion 32 fixed to 31 is meshed.

Further, a code plate 15 is attached to the outer peripheral surface of the cam barrel 13. The code plate 15 has focal length information obtained by dividing the focal length into predetermined ranges. The focal length information is read by a contact (not shown), aperture value information that changes depending on the focal length, stop timing information of the zoom motor 30. Used as etc.

In the space between the cam barrel 13 and the inner barrel 18, a plurality of guide rods 20 (however, only one is shown in FIG. 2) are arranged so as to extend parallel to the optical axis and surround the optical axis. Both ends are fixed to the camera body 10 and the makeup lens barrel 12, respectively. A front lens group frame 22 for moving the front lens group L1 for zooming and a rear lens group frame 24 for moving the rear lens group L2 are slidably fitted into the guide rod 20.
The rear lens group L2 is directly fixed to the rear lens frame 24.

The inner lens barrel 18 is fixed to the front lens group frame 22. Therefore, the inner lens barrel 18 is guided along the guide rod 20 so as to be movable back and forth in the optical axis direction. In this inner lens barrel 18,
Shutter block 26 with a known diaphragm and shutter
The front lens group L1 is screwed into the center hole of the shutter block 26 via the helicoid 28. Further, the feeding lever 27 protruding forward from the shutter block 26 and the arm 29 fixed to the front lens group L1 are engaged.
The lens feeding lever 27 moves on the circumference centered on the optical axis to rotate the front lens group L1 via the arm 29, and the helicoid
The action of 28 moves the front lens group L1 back and forth in the optical axis direction.

Two zooming cam grooves 16 and 17 are cut in the cam barrel 13. A cam pin 23 fixed to the front lens group frame 22 is fitted in one zooming cam groove 16, and a cam pin 25 fixed to the rear lens group frame 24 is fitted in the other zooming cam groove 17. ing. Therefore,
When the cam barrel 13 is rotated, the cam pins 23 and 25, that is, the front lens group L1 and the rear lens group L2 are moved to the zooming cam grooves 16 and 17, respectively.
Are moved toward and away from each other in the optical axis direction.

An arc-shaped charge capacitor 60 is fixed to the outer periphery of the rear lens group L2 at the front part of the rear lens group frame 24. The surface of the charge capacitor 60 is antireflection processed and is connected to a strobe circuit (not shown) in the camera body 10.

As described above, the lens barrel has a space, particularly a ring-shaped or arc-shaped space, and the present invention utilizes this space as a storage space for the charge capacitor.

Further, the finder device 40 includes an objective lens 41 and an eyepiece lens 42 fixed to the front and rear surfaces of the camera body 10, respectively.
And a variable power lens 43 mounted between the lenses 41 and 42 so as to be movable back and forth in the optical axis direction. This variable magnification lens
Reference numeral 43 denotes a zoom lens that moves back and forth in conjunction with zooming caused by the rotation of the zoom motor 30 to adjust the magnification of the finder device 40.
It changes according to the magnification of 11 (focal length).

The strobe device 50 is composed of a Fresnel lens 51 fixed to the front surface of the camera body, and a xenon tube 52 and a reflector 53 which are mounted behind the Fresnel lens 51 so as to be movable back and forth in the optical axis direction. The xenon tube 52 is integrally fixed to the reflecting umbrella 53, and the reflecting umbrella 53
Moves toward and away from the Fresnel lens 51 in conjunction with zooming due to the rotation of the zoom motor 30.
The irradiation angle of is changed according to the angle of view (focal length) of the zoom lens 11. The xenon tube 52 is connected to the charge capacitor 60 via a strobe circuit.

A cam plate 70 is mounted above the finder device 40 and the strobe device 50 so as to be movable in the left-right direction. A variable magnification finder cam groove 71 and an irradiation angle variable cam groove 72 are formed on the cam plate 70. A cam pin 44 fixed to the variable power lens 43 and a cam pin 54 fixed to the reflector 53 are fitted into the cam grooves 71 and 72, respectively.

Further, a lower bent portion 73 including an arm extending to the left is provided at the rear part of the cam plate 70, and a rack 74 is formed at the lower end of the lower bent portion 73. The rack 74 is linked to the gear 14 via a gear train 75. Therefore, when the zoom motor 30 rotates and the cam barrel 13 rotates, the rack 74, that is, the cam plate 70, moves left and right via the gear train 75. Therefore, the cam pins 44 and 54 fitted in the cam grooves 71 and 72 are interlocked with the lateral movement of the cam plate 70, and are moved back and forth together with the variable magnification lens 43 and the reflector 53.

In the illustrated embodiment, the charge capacitor 60 is formed in an arc shape, but it may be formed in an annular shape. The mounting position is arbitrary as long as it does not block the incident light beam. Further, the lens barrel may have a shape other than the cylindrical shape, and in this case as well, the charge capacitor 60 is formed along the inner peripheral shape of the lens barrel.

Further, although the charge capacitor 60 is mounted inside the lens barrel in this embodiment, it may be mounted outside the lens barrel. For example, in the lens barrel,
A structure may be used in which a concave portion is formed inward and the charge capacitor 60 is mounted in the concave portion.

The present invention has been described above based on the illustrated embodiment applied to a lens shutter type camera, but the present invention can also be applied to a single-lens reflex camera incorporating a strobe device. In this case, a member for connecting the charge condenser of the interchangeable lens and the strobe circuit in the camera body is provided.

"Effect of device" As is clear from the above description, since the present invention is equipped with the charge condenser for emitting the strobe on the lens barrel, the camera, especially the body can be downsized, and the portability, operability, It is possible to improve the usability.

[Brief description of drawings]

FIG. 1 is a perspective view showing the outline of the main part of an embodiment in which the present invention is applied to a lens shutter type camera equipped with a zoom lens and a strobe device, and FIG. 2 is a longitudinal section of the same embodiment taken along a plane passing through the optical axis. 3 is a cross-sectional view showing the upper half of FIG. 10 …… Camera body, 11 …… Zoom lens, 12 …… Makeup barrel, 13 …… Cam barrel, 18 …… Inner barrel, 20 …… Guide rod, 26 …… Front group lens frame, 24 …… Rear group lens frame, 30 ...
… Zoom motor, 40… Finder device, 50… Strobe device, 60… Charge capacitor

Claims (2)

[Scope of utility model registration request] 1. In a camera having a built-in strobe device, an arc-shaped or annular capacitor storage space is provided in a lens barrel of the camera, and a charge capacitor for causing the strobe device to emit light is adapted to the capacitor storage space. A charge capacitor mounting structure for a camera with a built-in strobe device, characterized in that the charge capacitor, which is formed in an arc shape or an annular shape and is housed in the capacitor housing space, is fixed to a frame member forming a lens barrel. 2. In the claim 1 of the utility model registration claim,
The charge capacitor is a camera charge capacitor mounting structure that is fixed to a lens frame that moves back and forth in the optical axis direction.