JPH02176736A - Photographing device - Google Patents

Abstract

PURPOSE:To eliminate a waste of the energy of stroboscopic light emission even if a shutter speed becomes faster than a stroboscopic synchronizing speed by providing a flash light scanning means which scans flash light from a flash light means corresponding to the aperture width of a focal plane shutter. CONSTITUTION:When a shutter release button is pressed after a film winding lever 30 is rotated by a specific quantity, the light emission part 12 of a stroboscopic device is rotated as shown by an arrow A by a leading curtain take-up shaft 18 synchronized with the movement of the slit of the focal plane shutter 10. Then an area 50 corresponding to the minimum slit width of the focal plane shutter 10 in a real photographic picture plane 48 which can be photographed on a film surface is irradiated with specific brightness as the area moves as shown by an arrow B according to the movement of the slit of the focal plane shutter 10. Thus, even if the shutter speed becomes faster than the stroboscopic synchronizing speed, the waste of the energy of the stroboscopic light emission is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a photographing device having a focal plane shutter and illuminating a subject with flash means (prior art). A camera having a strobe (electric flash) as a flashing means is well known. In conventional cameras, a specific shutter speed (generally 1/60 second to 1/125 second,
It was only possible to take pictures using a strobe at a certain speed (referred to as strobe sync speed). However, in recent years,
Japanese Patent Application Laid-Open No. 55-12 disclosed a flat light-emitting strobe device that can obtain a predetermined amount of light at all shutter speeds by emitting light in pulses at extremely short cycles.
It is known from Japanese Patent Application Laid-open No. 9327, Japanese Patent Application Laid-Open No. 59-222821, and Japanese Patent Application Laid-Open No. 60-257435. Such a flat light emitting strobe device uses a strobe at all shutter speeds of a camera with a focal plane shutter. This makes it possible to take pictures with the camera.

In particular, the ability to take pictures using a strobe at a shutter speed higher than the conventional strobe synchronization speed brings various advantages to photographers' photographic techniques.

(Problem to be Solved by the Invention) However, in the conventional flat light emitting strobe device described above, no matter how fast the shutter speed becomes, the slit of the focal plane shutter crosses a predetermined optical path in front of the film. Since the strobe light is emitted with an amount of light that evenly covers the entire area of the predetermined optical path, the energy of strobe light emission is wasted.

This invention was made under the above circumstances, and the purpose of this invention is to
To provide a photographing device such as a focal plane shutter camera with a strobe device that does not waste the energy of strobe light emission even if the shutter speed becomes faster than the strobe synchronization speed.

(Means for Solving the Problems) In order to achieve the above object, the photographing device of the present invention includes: a focal plane shutter; a flash unit for illuminating a subject; and a flash unit that corresponds to the aperture width of the focal plane shutter. and a flash scanning means for scanning the flash from.

(Function) The photographing device according to the present invention includes a focal plane shutter and a flash unit for illuminating a subject.
A flash scanning means controls the flashing means to scan the flashing light from the flashing means in accordance with the aperture width of the focal plane shutter.

(Embodiments) Various embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 schematically shows the main parts of a photographing device according to a first embodiment of the invention.

In FIG. 1, reference numeral 10 indicates a horizontally running four-axis focal plane shutter using a cloth curtain, and reference numeral 12 indicates a light emitting portion of a strobe as flash means.

The focal plane shutter 10 includes a pair of front curtain winding shafts 16 and 18 for moving the front curtain 14.
and a pair of trailing curtain winding shafts 22 for running the trailing curtain 20.
and a trailing curtain winder 24. The leading end of the leading curtain 14 is fixed on the leading curtain winding shaft 18, and the leading end of the leading curtain 14 is
Since a string 26 extending from both upper and lower ends of the rear end of the leading curtain 14 is wound around the leading curtain winding shaft 16, tension is maintained between the pair of leading curtain winding shafts 16 and 18. It is set up. The rear end of the trailing curtain 20 is fixed on a trailing curtain winding shaft 22, and a string 28 extending from both upper and lower ends of the front end of the trailing curtain 20 is wound around a trailing curtain winding shaft 24. As a result, it is stretched between the pair of trailing curtain winding shaft 22 and trailing curtain winding shaft 24.

The leading curtain winding shaft 16 and the trailing curtain winding shaft 22 are provided with an input for the leading gear 36 and the trailing curtain gear 38 from a notched gear 34 located at the end of a winding gear train 32 driven by a film winding lever 30. By being input to the gear 40, the pair of strings 26 at the rear end of the leading curtain 14 and the rear end portion of the trailing curtain 20 are wound around the respective outer peripheral surfaces. When a shirt release button (not shown) is pressed in this state, the leading curtain 14 is first wound up from the leading curtain winding shaft 16 to the leading curtain winding shaft 18, and then a predetermined shirt timing is created. The focal plane shutter 10 having such a configuration is known, in which the trailing curtain 20 is wound up from the trailing curtain winding shaft 22 to the trailing winding shaft 24 at predetermined intervals.

The reflector 44 and light converging plate 46 that surround the discharge tube 42 in the light-emitting part 12 of the strobe as a flash means have the minimum slit width of the focal plane shutter 10 in the actual image that can be captured on the film surface by the photographing device. The reflecting mirror 44 is connected to the leading curtain winding shaft 18 so as to be rotationally driven by the leading curtain winding shaft 18.

The above-mentioned strobe is of a flat emission type, and the discharge tube 42 maintains a substantially constant brightness from when the front curtain 14 of the focal plane shutter 10 starts running until it stops.

In the photographing apparatus according to the first embodiment of the present invention configured as described above, when the aforementioned shirt release button (not shown) is pressed after the film winding lever 30 has been rotated by a predetermined amount, the flashing means is activated. The light emitting part 12 of the strobe is rotated by the front curtain winding shaft 18 as shown by arrow A in FIG. The area 50 corresponds to the minimum slit width of the focal plane shutter 10 within the real-action screen 48 that can be imaged on the film surface by the photographing device.
As it moves as shown by arrow B in the figure, it is irradiated with a predetermined brightness as shown in FIG.

Next, a second embodiment of the present invention will be described with reference to FIGS. 4 to 6.

The light emitting portion 60 of the strobe serving as the flashing means of the photographing device according to this embodiment has a plurality of integrated reflecting mirrors 62 as shown in FIG. A discharge tube is housed inside, and the opening of the internal space is covered with a light converging plate. Each of the plurality of reflecting mirrors 62 becomes a plurality of reflecting mirrors 62 when the respective discharge tubes emit light.
A plurality of areas C, DE of the live-action screen 48 divided into the same number as
, F, and G, respectively.

Each of the plurality of regions C, D, E, F, and G is projected onto the film surface by the minimum slit width in the focal plane shutter of the photographing device of the second embodiment.

FIG. 5 schematically shows an electric circuit 63 of a strobe in a second embodiment. Here, a plurality of discharge tubes 68a, 68b in a plurality of reflecting mirrors 62 are connected to two conductive wires 64,66 connected to a booster circuit (not shown).

68C1... are a plurality of first thyristors 70a, 70
b, 70c, .
A plurality of sets of 4b, 74c, . . . are a plurality of discharge tubes 68a.
, 68b, 68c, . . . and the plurality of first thyristors 7
0 a, 70 b, 70 c, --...
are connected in parallel to multiple sets of A plurality of discharge tubes 68a, 68b, 68c, ... and a plurality of first thyristors 70a, 70b, 70c.
, −= are a plurality of resistors 7 adjacent to these.
2 and a plurality of second thyristors 74a, 74b, 74c
.

... are connected via a capacitor 76 at an intermediate position between each pair. Between the two conductive wires 64.66, a plurality of discharge tubes 68 a
, 68b, 68c, - and a plurality of first thyristors 70a, 70b, 70c, . . . or a plurality of resistors 72 and a plurality of second thyristors 74.
A main capacitor 78 is connected upstream of the plurality of pairs of capacitors a, 74b, 74c, . A plurality of first thyristors 70a, 70b, 70c.

... and a plurality of second thyristors 74a, 74b.

Each gate terminal of 74c, . . . is connected to a microcomputer 80 for strobe control.

In the strobe electric circuit 63 described above, the plurality of first thyristors 70a, 70b, 70c.

A predetermined current is sequentially supplied from the microcomputer 8o to the gate terminals of the plurality of discharge tubes 68.
a, 68b, 68c, -... sequentially emit light, and the plurality of second thyristors 74a, 74b,
74c.

A plurality of discharge tubes 68 are sequentially supplied with a predetermined current from the microcomputer 80 to the gate terminals of the discharge tubes 68.
The light emission of a, 68b, 68c, . . . stops sequentially.

FIG. 6 shows a plurality of discharge tubes 68a, 68b, 68c, .
The timing of light emission is shown corresponding to the position of the slit of the focal plane shutter. Here, the reference symbols C-, D-, E-F'', and G- represent the live-action screen 4.
2, multiple areas C and D.

The positions of the slits corresponding to E, F, and G are shown, and as is clear from FIG.
Immediately before a plurality of areas C, D, EF, and G of the live-action screen 42 are completely overlapped with each other on the film, a plurality of discharge tubes 68a and 68b are sequentially and completely overlapped with each of E-, I'', and G-. ,6
8c, . . . are sequentially emitted.

(Effects of the Invention) As described in detail above, the photographing device of the present invention includes a focal plane shutter and a flash unit for illuminating a subject, and further includes a flash light from the flash unit corresponding to the aperture width of the focal plane shutter. Since the present invention is characterized in that it is equipped with a flash scanning means for scanning, even if the shutter speed becomes faster than the strobe synchronization speed, the energy of strobe light emission is not wasted.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a focal brain shutter of a photographing device according to a first embodiment of the present invention and a light emitting part of a strobe as flash means; FIG. A schematic diagram showing a state in which the light-emitting portion of the strobe of the first embodiment scans the live-action screen in the photographing device according to the embodiment; FIG. A schematic diagram showing the state of the luminance of the discharge tube in the light emitting part from the time when scanning starts to the time when scanning ends; FIG.
A diagram schematically showing a state in which a light emitting portion of a strobe serving as a flash unit of a photographing device according to a second embodiment of the present invention illuminates a live-action screen in the photographing device; FIG. FIG. 6 is a diagram schematically showing an electric circuit for a strobe as a flashing means of a photographing device according to the second embodiment; FIG. FIG. 2 is a diagram schematically showing the timing at which discharge tubes in a plurality of reflecting mirrors of a light emitting part of a strobe light emit light. DESCRIPTION OF SYMBOLS 10... Focal brain shutter, 12... Light emitting part (flash means), 18... Leading curtain winding shaft (flash scanning means), 60... Light emitting part (flash means), 63...
- Electric circuit (flash scanning means). Applicant's agent Patent attorney Atsushi Tsuboi

Claims (1)

[Claims] The present invention is characterized by comprising: a focal plane shutter; a flash unit for illuminating a subject; and a flash scanning unit for scanning the flash from the flash unit in accordance with the aperture width of the focal plane shutter. Photography equipment.