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Shutter device in automatic focusing and exposure camera

a technology of automatic focusing and shutter device, which is applied in the direction of shutters, instruments, exposure control, etc., can solve the problems of difficulty in synchronizing the strobe light emission with the shutter in daylight synchro mode, and increase the shutter speed, so as to achieve the effect of simplifying the shutter and increasing the shutter speed

Inactive Publication Date: 2000-11-07
ASAHI KOGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The primary object of the present invention is to provide a shutter device having an increased shutter speed.
With this arrangement, the lens shutter can be simply constituted by the operations of the first sector mechanism and the second sector mechanism in combination. Furthermore, a desired shutter speed can be obtained only by the control of the shutter opening device and the shutter closing device, thus resulting in a realization of a high speed shutter. The exposure can be easily controlled by controlling the aperture of the second sector mechanism by the diaphragm control device.
With this construction, the shutter can be simplified and an increased shutter speed can be provided. Since the operation of the first sector mechanism to commence the exposure in the daylight synchro mode can be controlled by the pulses, the motor strobe light can be emitted at a predetermined timing in accordance with a light emission signal synchronous with the pulses.

Problems solved by technology

Thus, in the conventional shutter, since the same sectors are opened and closed for shutter control, it is very difficult to increase the shutter speed.
Furthermore, in an attempt to increase the shutter speed, there is difficulty in synchronization of the strobe light emission with the shutter in the daylight synchro mode.

Method used

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  • Shutter device in automatic focusing and exposure camera
  • Shutter device in automatic focusing and exposure camera
  • Shutter device in automatic focusing and exposure camera

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

FIG. 1 shows an exploded perspective view of a shutter device according to the present invention.

The shutter device 1 of the present invention has a release portion 2, a drive portion 3, a drive mechanism holding block 4 and a focus adjusting lens barrel 5.

The release portion 2 has annular bases 8 and 9 having holes 6 and 7 having a center on the optical axis O. A first sector mechanism 10 having a pair of sector blades 10a and 10b and a second sector mechanism 11 having a pair of sector blades 11a and 11b are provided between the two annular bases 8 and 9.

The annular base 9 has shafts 12, 13 and 14. The sector blade 10a is rotatably mounted to the shaft 12, and the sector blade 11b is rotatably mounted to the shaft 14. The sector blades 10b and 11a are rotatably mounted to the shaft 13.

The drive portion 3 has an operational plate 16 which has a center hole 15. Around the operational plate 16 are provided a switch lever 103 which actuates a start switch 100, a lever member 110, an o...

second embodiment

In the illustrated second embodiment, although the ratchet teeth 54 are provided only on the sector blade 11l that constitutes the second sector mechanism 11, it is possible to additionally provide ratchet teeth on the sector blade 11b to enhance the diaphragm holding effect of the abutment lever 36.

The following discussion will be directed to a third embodiment of the present invention, shown in FIGS. 15 through 29 in which the elements corresponding to those in the above mentioned first and second embodiments are designated with the same reference numerals.

third embodiment

One of the main features of the third embodiment is directed to the selection of a "normal photographing mode" and a "daylight synchro mode" by a mode selection switch.

The operation ring 20 is provided on its outer periphery with a ratchet teeth 20a. Pivoted adjacent to the operation ring 20 is a lens abutment lever 135 which has at its one end a pawl 135a and which is rotatable about a shaft 136. The spring 137 is provided between the opposite end of the lens abutment lever 135 and the body of the shutter device, so that the lens abutment lever 135 is rotated in the counterclockwise direction by the spring 137. The rotation of the lens abutment lever 137 is restricted by the bar member 139. The spring 137 is weaker than the spring 61. Accordingly, when the second sector lever 21 is rotated in the clockwise direction to come into contact with the positioning pin 62, the lens abutment lever 135 is pressed up by the bar member 139 at the opposite end of the lens abutment lever to rota...

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PUM

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Abstract

A shutter device of a camera which includes first and second sector mechanisms which constitute a lens shutter and which are independently opened and closed to define an aperture. A photometer, for detecting the luminance of an object to be photographed, and a diaphragm controller for controlling the aperture defined by the second sector mechanism, in accordance with luminance data detected by the photometer, are provided. A shutter opening element is provided which normally closes the first sector mechanism and opens the first sector mechanism when the second sector mechanism is held to define a predetermined aperture determined by the diaphragm controller, and a shutter closing element is provided which closes the second sector mechanisms at a predetermined timing in accordance with the luminance data of the photometer after the first sector mechanism is opened by the shutter opening element.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to a shutter used in an automatic focus and automatic exposure camera, and more precisely it relates to a shutter in which shutter sectors are opened and closed to actuate (release) a lens shutter. The present invention also relates to a daylight synchro photographing method.2. Description of the Related ArtIn a known automatic focus and exposure camera the focusing control and the exposure control are successively effected in accordance with the release operation. The lens is first moved to a focused position in association with the release operation, and then, the lens shutter is actuated. In such an automatic focusing and automatic exposure camera, more than one sector (shutter blades) are opened and closed to selectively intercept the light path. The exposure value is determined in accordance with the opening operation of the sectors and the shutter speed is determined by a time in which the sector...

Claims

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Application Information

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IPC IPC(8): G03B7/08G03B9/14G03B7/10G03B9/10G03B7/16
CPCG03B7/08G03B9/14G03B7/16G03B7/10G03B7/087
Inventor KOBAYASHI, TAKUMIKAWANO, KIYOSHI
Owner ASAHI KOGAKU KOGYO KK