JPH07294973A - Camera - Google Patents

Abstract

PURPOSE:To dispense with a guiding shaft, to reduce cost and to obtain a compact variable irradiating angle stroboscope by moving a strobe light emitting part in accordance with an operation for varying the power of a zoom lens, so as to change the irradiating angle of a stroboscope. CONSTITUTION:When a driving barrel 1 is rotated via a gear train 12 by the rotation of a motor 11 by the operation for varying the power of a photographic lens, a disk cam 2 is routed and a finder lens group is moved via cam grooves 2a and 2b by the rotation of the disk cam 2. Simultaneously, a reflecting plate holding frame 10 is moved in an optical axial direction as a fitting guide for chin parts 10a and 10b and rail grooves 20a and 20b. Then, a light emitting tube 18 as the strobe light emitting part. is integrally moved with be reflecting plate holding frame 10, to change the distance between a Fresnel lens 33 and the strobe light emitting part and the irradiating angle of the stroboscope in accordance with a viewing angle for photographing. Thus, two guide rail grooves are used instead of the conventional guiding shaft to dispense with the stop of the rotation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strobe irradiation angle changing device which is linked to a zoom operation of a zoom lens of a lens shutter camera.

[0002]

2. Description of the Related Art Conventionally, there has been known one in which an irradiation angle of a strobe is changed in accordance with a zooming operation of a zoom photographing lens. FIG. 3 shows a conventional example. Reference numeral 1 drives a zoom photographing lens optical system (not shown) to a state between a tele end (telephoto side end) state and a wide end (wide angle side end) state or a retracted state (non-photographing state). It is a drive cylinder. A gear 1 a is formed on the outer circumference of the drive cylinder 1. Rotational force is applied to the gear 1a from the motor 11 via the gear train 12 to drive the drive cylinder, and the rotational force further varies the finder mechanism 16 and the strobe mechanism 17 via the drive gears 15 and 14. It is transmitted to the drive gear 2d of the disc cam 2. That is, the rotational force of the drive cylinder 1 is used by the disc cam 2 to cause the viewfinder mechanism 16 and the strobe mechanism 17 to perform a zooming operation. The disc cam 2 is driven by the drive gear 2d to rotate about the rotary shaft 2e in the direction of the arrow in the figure or in the direction opposite to the arrow.

The finder includes objective lens groups 3 to 5, a reflection mirror 21, a field frame 6 of the finder, and a pair of a lower panoramic field frame 22 and an upper panoramic field frame 23 for covering the top and bottom of the finder field frame 6 during panoramic photography. It is composed of a reflection mirror 24, a prism 25, and an eyepiece lens 26.
When the photographing screens of the lower panoramic field frame 22 and the upper panoramic field frame 23 are switched to the panoramic state by means (not shown), they rotate around axes 22a and 23a in the directions of arrows in FIG. It covers a certain area and switches the field of view of the finder image to the shape of a panoramic screen. When switching from the panoramic state to the normal state, the reverse operation described above is performed.
The disc cam 2 has cam grooves 2a and 2b for advancing and retracting the viewfinder variable magnification lens groups 3 and 4 along the guide shaft 8 and a cam groove 2c for advancing and retracting the strobe light emitting unit 10 'along the guide shaft 9. Has been done.

The strobe light emitting section 10 'advances and retreats along the guide shaft 9, but is rotatably provided with the shaft 9 as the center of rotation, so that the follower pin 10'c is tilted with respect to the cam groove 2c to prevent malfunction. For this reason, the rotation stopper 10'd is formed on the camera body 41 and is connected to the rotation stopper 10'd to prevent the rotation.

[0005]

With the guide mechanism of the stroboscopic light emitting portion constructed as described above, the conventional guide shaft 9 is used.
Since it was a single part with a circular cross section perpendicular to the direction of extension, it resulted in increased costs and increased man-hours for assembly. Further, in order to prevent the rotation around the guide shaft 9, it is necessary to secure the space for forming the rotation stopping portion 10'd, which hinders the downsizing of the camera itself.

The present invention has been made in view of the above problems, and it is an object of the present invention to eliminate the guide shaft 9, reduce the cost, and provide a small irradiation angle variable strobe.

[0007]

In order to achieve the above object, the present invention provides a zoom lens, a strobe light emitting device capable of changing an irradiation angle by moving a strobe light emitting portion, and a camera body. As a guide for moving a component different from the fixed strobe light emitting component, a strobe irradiation angle is changed by moving the strobe light emitting unit according to the zooming operation of the zoom lens.

[0008]

In the present invention, since the moving guide is a component different from the strobe light emitting component fixed to the camera body, it is not necessary to provide a dedicated component such as a guide shaft and the cost can be reduced.

[0009]

FIG. 1 shows an embodiment of the present invention. 1 is a zoom photographing lens optical system (not shown) at the tele end (telephoto end)
The drive cylinder is driven to either a state between the state and the wide end (wide-angle side end) state or the retracted state (non-photographing state). A gear 1 a is formed on the outer circumference of the drive cylinder 1. Rotational force is applied to the gear 1a from the motor 11 via the gear train 12 to drive the drive cylinder, and the rotational force further varies the finder mechanism 16 and the strobe mechanism 17 via the drive gears 15 and 14. It is transmitted to the drive gear 2d of the disc cam 2. That is, the rotational force of the drive cylinder 1 is used by the disc cam 2 to cause the viewfinder mechanism 16 and the strobe mechanism 17 to perform a zooming operation. The disc cam 2 is driven by the drive gear 2d to rotate about the rotary shaft 2e in the direction of the arrow in the figure or in the direction opposite to the arrow.

A viewfinder case 20 includes the objective lens groups 3 to 5, the reflecting mirror 21, the field frame 6, the lower panoramic field frame 22, the upper panoramic field frame 23, the reflecting mirror 24, the prism 25, and the eyepiece lens shown in FIG. 26 is built in. The reflector 2 is provided on the reflector holding frame 10 of the stroboscopic light emitting section.
7, an arc tube 18, and a lamp 19 for emitting red-eye reduction light and for displaying a self-timer are held. Jaw portions 10a, 1 provided to project from the holding frame 10 at one end of the reflection holding frame 10.
0b is formed on the upper and lower sides. This jaw 10a, 10b
Are rail grooves 20a, 20 formed in the finder case.
b, and is freely movable in a direction parallel to the optical axis direction of the finder objective lens. FIG. 2 shows the AA cross section. The arc tube 18 has electrode portions 18a and 18b. Rail groove 2
The electrode portion 18a of the arc tube 18 was provided in the space between 0a and 20b. As a result, it was possible to prevent the stroboscopic light emitting section from further spreading to the right side in the figure. A follower pin 1 similar to that shown in FIG. 3 is provided on the lower surface of the reflector holding frame 10 of the stroboscopic light emitting section.
0c is formed, penetrates the finder case hole 20c, and engages with the cam groove 2c of the disc cam 2. 32
Is an electric circuit component that constitutes a strobe circuit, and is a circuit board 2
Implemented in 8. Reference numeral 20d is a hole for forming the rail groove 20b, which is convenient for the molding die. Reference numeral 31 is a substrate on which an IC for controlling the camera, autofocusing, etc. is mounted. 28a is connected to 31 by a solder bridge. 29 is a liquid crystal display panel. Reference numeral 30 is a block on which a light projecting lens for autofocus and a distance measuring element are mounted.

Here, the operation of changing the irradiation angle of the strobe in conjunction with the zoom operation will be described. When the drive lens 1 is rotated via the gear train 12 by the rotation of the motor 11 in the zooming operation of the taking lens, the disc cam 2 rotates about 2e. The rotation of the disc cam 2 moves the finder lens groups 3 and 4 through the cam grooves 2a and 2b. At the same time, the reflector holding frame 10 is moved in the optical axis direction via the cam groove 2c using the coupling between the jaws 10a, 10b and the rail grooves 20a, 20b as a guide. Reflector holding frame 10
The arc tube 18 which is the light emitting portion of the strobe is moved integrally with the above. By changing the distance between the Fresnel lens 33 and the light emitting portion, the strobe irradiation angle is changed according to the photographing field angle.
In the figure, the Fresnel lens 33 is shown at a position away from the strobe light emitting portion, but it is actually located near the light emitting portion and is closest when the taking lens is at the wide end and farthest away from the tele end. In FIG. 1, the wide end state is shown.

Since there are two guide rail grooves from the guide shaft, there is no need for a conventional rotation stopper, and space can be saved, leading to downsizing. The upper and lower rail grooves formed in the finder case are engaged with the jaws formed integrally with the strobe reflector holding frame. Therefore, there is no great rattling around the extending direction of the rail due to the change of the gravity direction, and the jaw has a certain length in the extending direction of the rail. Therefore, even if there is a slight gap between the rail groove and the jaw, the rotation of the disc cam causes the rotation component force in the direction perpendicular to the extending direction of the rail groove to work smoothly without striking the flash light. I was able to move the department.

[0013]

[Effect] According to the above, it is not necessary to provide a dedicated guide shaft for moving the stroboscopic light emission part when the stroboscopic light emission part is moved and the strobe light emission angle is changed in accordance with the zoom operation of the photographing lens, so that the cost is reduced. Leads to. Since the moving guide portion is formed of a plurality of coupling portions, it is possible to suppress the play around the extending direction of the guide due to the change of the gravity direction.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a cross section AA of FIG.

FIG. 3 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 1 Zoom drive cylinder 2 Disc cam 3 to 6, 21 to 26 Finder optical system 8 Finder variable magnification guide axis 10 Strobe reflector holding frame 20 Finder case 28 Strobe circuit board

Claims (5)

[Claims] 1. A zoom lens, a strobe light emitting device capable of changing an irradiation angle by moving a strobe light emitting part, and a component different from a strobe light emitting part component fixed to a camera body. As a guide of (1), the camera is characterized in that the stroboscopic light emitting section is moved in accordance with the zooming operation of the zoom lens to change the strobe irradiation angle. 2. The camera according to claim 1, wherein the movement guide portion is integrally formed with a finder case of the camera. 3. The camera according to claim 1, wherein the movement guide portion is formed narrower than a vertical width of the strobe light emitting device. 4. The camera according to claim 3, wherein the movement guide part is formed of a plurality of coupling parts. 5. The space formed between the plurality of coupling parts is configured such that one end of an arc tube of the stroboscopic light emitting device is movable along with a zooming operation of the zoom lens. The listed camera.