JPH11183973A - Built-in flash light emitting device for single lens reflex camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a built-in flash light emitting device for a single lens reflex camera capable of preventing the vignetting of strobe light without making external size large. SOLUTION: A stroboscopic device 20 is housed in a housing part provided ahead of a pentagonal prism 3 on a photographing lens barrel 2 so as to keep away from the prism 3. In the case of emitting light, the device 20 is opened toward the front of the camera by a stroboscopic case 8 turning by a hinge part 10 provided on a stroboscopic base 11 fixed on a camera body housing 1 and an arm 12 turning by a hinge part 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly, to a built-in flash light emitting device of a single-lens reflex camera in which a strobe light emitting portion pops up by operating an operation member.

[0002]

2. Description of the Related Art Conventionally, as a mechanism for popping up a strobe light emitting portion, Japanese Utility Model Publication No. 5-31 has been proposed.
No. 633 discloses a mechanism for entering and exiting a built-in strobe light emitting unit in a single-lens reflex camera.

FIG. 5 and FIG. 6 are central longitudinal sectional views of a main part of a single-lens reflex camera to which the above-mentioned access mechanism is applied in a vertical plane including a + photographing optical axis.

[0004] In the above-mentioned strobe light emitting / retracting mechanism, when the strobe housing 114 accommodating the strobe light emitting unit is stored in the strobe housing storage chamber 116 of the camera housing 112, as shown in FIG. Stop lever 138
Hook 140 is engaged with the pin 120 of the flash housing 114 to prevent the flash housing 114 from jumping out due to the urging force of the tension spring 128.

[0005] Then, when the photographer pushes down the operation projection 158 downward, the slider 154 and the pin 156 are pushed down integrally, and the connecting member 146 rotates clockwise. The rotation causes the locking lever 138 to rotate counterclockwise, disengaging the hook 140 from the pin 120,
The leg lever 118 rotates counterclockwise by the urging force of the tension spring 128, and the strobe housing 114 is moved to the storage chamber 116.
From above, and the flash strobe rises as shown in FIG. When storing the flash housing 114,
When the front surface of the strobe housing 114 is pushed in the direction of the arrow, the strobe is housed as shown in FIG.

In this access mechanism, a strobe housing 1 is provided.
14, the leg cover 118, the tension spring 128, the locking lever 138, and the like correspond to a pop-up mechanism, and the combination of the operation protrusion 158 and the slider 154 corresponds to a pop-up operation member. It is considered that a portion in which the 148 and the spring 152 and the like are connected to the pop-up operating member and the pop-up mechanism, and correspond to a pop-up interlocking member that transmits the movement of the pop-up operating member to the pop-up mechanism.

[0007]

However, in the above-mentioned technical means in the form of an access mechanism of a built-in strobe light emitting unit disclosed in Japanese Utility Model Publication No. Hei 5-31633, a strobe housing storage chamber is provided above a pentaprism 103. Since the flash case 116 is formed and the strobe housing 114 is stored in the storage room, the height of the entire camera in the height direction is increased. Such an increase in the size of the outer shape is inconvenient for a camera that is increasingly required to be smaller in recent years.

On the other hand, in such a camera, the strobe light emission position is located rearward when viewed from the entire camera. Therefore, in a camera having a recent high-magnification zoom lens mechanism, a lens barrel is used when taking a close-up photograph. There is a problem that vignetting of strobe light occurs. In order to solve this problem, the strobe light emission position must be further raised, which also increases the size of the camera.

The present invention has been made in view of the above problems, and has as its object to provide a built-in flash light emitting device of a single-lens reflex camera that does not cause vignetting of strobe light without increasing the external dimensions. .

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, a first built-in flash light emitting device of a single-lens reflex camera according to the present invention is different from a built-in flash light emitting device of a single-lens reflex camera by avoiding a pentaprism. A storage chamber provided in front of the pentaprism, a light emitting means movable to a light emitting position protruding from the storage chamber and a storage position housed inside the storage chamber, and A light-emitting unit moving means provided in the storage chamber so as to be moved to and from the storage position.

[0011] In order to achieve the above object, a second aspect of the present invention is provided.
The built-in flash light emitting device of the single-lens reflex camera is a built-in flash light emitting device of the single-lens reflex camera. A light-emitting unit holding frame that holds the light-emitting unit, and a light-emitting unit holding frame that is rotatably supported at a light-emitting position that protrudes from the storage chamber and a storage position that is stored inside the storage chamber, and A rotating shaft provided in front of the camera with respect to the light-emitting unit when in the storage position.

In order to achieve the above object, a third aspect of the present invention is provided.
The built-in flash light emitting device of the single-lens reflex camera is a built-in flash light emitting device of the single-lens reflex camera. The light-emitting portion is fixedly held inside, and the light-emitting portion is moved to a light-emitting position protruding from the storage chamber and a storage position stored in front of the pentaprism inside the storage chamber in proximity to the pentaprism. Movably, a light-emitting unit holding frame rotatably supported around a rotation shaft provided at a front position further away from the pentaprism than the position of the light-emitting unit when in the storage position; And a window through which the illumination light of the light emitting unit is transmitted so as to be exposed to the outside when in the storage position.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are central longitudinal sectional views on a vertical plane including a photographing optical axis of a single-lens reflex camera according to an embodiment of the present invention. FIG. 1 shows a state in which a strobe device is stored. FIG. 2 shows a state in which the strobe device is lifted and opened.

As shown in FIGS. 1 and 2, the single-lens reflex camera according to the present embodiment has a camera body housing 1 containing a photographic lens barrel 2, a pentaprism 3, and the like, and a photographic image taken in front of a pentaprism 9. A flash device 20 disposed in a space (flash storage section) formed in an upper portion of the lens barrel 2.

The camera body housing 1 includes a pentaprism 3
Has a photographic lens barrel cover 1a integrally formed with the photographic lens barrel 2 protruding forward from the camera body inside.

The strobe device 20 is stored in a predetermined storage position (non-light-emission position) of the above-mentioned strobe storage portion when the light is not emitted, and rises from the storage position when the light is emitted, that is, pops up and moves to a prescribed light-emission position.

Hereinafter, the strobe device 20 will be described in detail. The strobe device 20 includes a photographing lens barrel 2
, A light-emitting unit supporting portion including a strobe cover 4 and a strobe case 8 extending from the strobe base 11, and an arm also extending from the strobe base 11. The main part is composed of the light emitting unit 12 and the light emitting unit 30 disposed at the tip of the strobe cover 4 and the strobe case 8.

The strobe base 11 is fixedly mounted on the camera body casing 1 on the upper surface of the camera body casing 1 (photographing lens barrel cover 1a) above the photographing lens barrel 2. . A hinge portion 10 is provided at the front end of the strobe base 11. The hinge part 1
At 0, the base end of the flash case 8 is rotatably supported and extends from the flash base 11.

A recess is formed at the tip of the flash case 8, and the light emitting section 30 is housed in the recess. The light emitting section 30 has a xenon tube 7 having a normal strobe light emitting function and a reflecting umbrella 6 provided inside the concave storage section formed at the tip of the strobe case 8, and a strobe cover 4 is provided on the front surface of the reflecting umbrella 6. A fixed strobe light emitting unit window 5 is provided. The xenon tube 7 is fixed to the reflector 6.

On the front surface of the flash case 8,
A strobe cover 4 serving as an exterior part is covered, and is movable integrally with the strobe case 8.

Further, a guide groove 9 having a substantially elliptical shape is formed in the middle of the free end of the flash case 8 along the longitudinal direction of the flash case 8, and is engaged with a cam 14 described later.

In the strobe base 11, a hinge 13 is provided behind the hinge 10. A base end of an arm 12 is rotatably supported by the hinge 13 and extends from the flash base 11. A cam 14 is formed at the tip of the arm 12,
The cam 14 is slidably engaged with the guide groove 9.

A strobe spring 15 which is a torsion spring is mounted on the hinge portion 10. One end of the strobe spring 15 is connected to the strobe cover 4 and the other end is connected to the strobe base 11, so that the strobe cover 4 and the strobe The strobe device 20 that rotates integrally with the cover 4 is urged in a counterclockwise direction, that is, a direction in which the strobe device 20 is opened.

An operation knob 18 that slides in the front-rear direction is provided on the camera body housing 1 near the rear portion of the strobe base 11. A strobe device locking portion 16 having a key-shaped protruding portion formed at the rear end is integrally fixed to the operation knob 18. A flash device locking spring 17 for urging the flash device locking portion 16 forward is provided between the flash device locking portion 16 and the camera body housing 1. The flash device locking portion 16 is exposed to the outside of the camera body housing 1 and can be operated to slide backward with a finger or the like.

When the strobe device 20 is in the stowed state, that is, when the strobe device 20 is closed at the stowed position (see FIG. 1), the strobe device locking portion is opened from the strobe cover 4. A hook 19 is provided to engage with the key portion 16. The tip of the hook 19 and the key portion of the flash device locking portion 16 mesh with each other when the flash device 20 is in the storage position as shown in FIG. At this time, this meshing state is maintained by the urging force of the strobe device locking spring 17, and the opening of the strobe device 20 is regulated against the urging force of the strobe spring 15.

On the other hand, the user operates the operation knob 18
Is slid rearward, the flash device locking portion 16 moves rearward against the urging force of the flash device locking spring 17. Accordingly, the engagement between the flash device locking portion 16 and the hook 19 is released, and the flash device 20 is released.
Is opened around the hinge portion 10 by the urging force of the strobe spring 15 (see FIG. 2).

Next, the operation of the electronic flash device 20 of the embodiment having the above-described configuration will be described.

The strobe device 20 is folded and closed as shown in FIG. 1 when no light is emitted, and is housed so that the light emitting unit 30 is located near the front of the pentaprism 3. At this time, the opening of the strobe device 20 is regulated by the strobe device locking portion 16, the hook 19, and the like as described above.

Now, the user operates the operation knob 18
Is moved rearward, and when the engagement between the flash device locking portion 16 and the hook 19 is released, the flash cover 4, the flash case 8, and the flash emission window 5 fixed integrally with the hook 19. The reflecting umbrella 6 and the xenon tube 7 are rotated counterclockwise around the hinge 10 by the strobe spring 15.

At this time, the arm 12 rotates counterclockwise around the hinge 13. Accordingly, the cam 14 starts sliding along the guide groove 9. This cam 14
When the light reaches the end of the guide groove 9, the rotation of the strobe device 20 such as the strobe case 8 stops, and the light emission position (FIG. 2)
Reference).

As described above, in the present embodiment, the strobe light emitting section is housed in front of the pentaprism 3 and is rotated around the upper front part of the taking lens barrel 2 to pop up. As a result, there is an effect that the height of the camera can be reduced as compared with the case where the strobe mechanism is arranged above the pentaprism.

Further, since the strobe light emitting portion moves upward and forward of the camera, it is possible to prevent the strobe light from being vignetted by the lens barrel even in a close-up shooting.

Next, as shown in FIG.
The angle formed between the strobe light emitting unit window 5 and the optical axis of the photographing lens when 0 is opened and reaches the light emission enabling position will be described.

FIG. 3 is an enlarged sectional view of a main part of the light emitting unit 30 of the strobe device 20 in an enlarged manner.

As shown in the figure, it is desirable that the angle θ between the strobe light emitting unit window 5 and the optical axis of the photographing lens is around 90 °.
If the strobe light emitting unit window 5 is set to be perpendicular to the taking lens barrel 2, the rotation angle of the strobe device 20 itself becomes large. As described above, when the turning angle of the strobe device 20 itself is increased, the rotation angle of the arm 12 is also increased. Accordingly, the amount of the cam 14 sliding on the guide groove 9 provided in the flash case 8 is increased, and the length of the guide groove 9 must be increased. Arm 1
2 interferes with the hinge portion 13 which is the center of rotation. On the other hand, if an attempt is made to increase the length of the arm 12, a problem occurs that the arm 12 interferes with the reflector 6.

In consideration of the above, the angle θ between the strobe light emitting unit window 5 and the optical axis of the photographing lens (see FIG. 2)
Is desirably 75 ° or less.

The smaller the angle θ between the strobe light-emitting unit window 5 and the optical axis of the photographing lens is, that is, the more efficient the stroboscopic device 20 is in the state where the stroboscopic device 20 is lying with respect to the photographing lens barrel 2 at the position where light emission is possible. However, in this case, the vertical asymmetry of the reflector 6 becomes large, and the amount of light radiated to the lower side is smaller than the amount of light radiated to the upper side of the screen to be photographed.

Furthermore, the angle of incidence of the light beam irradiated on the lower side of the screen and the strobe light emitting unit window 5 becomes large. The transmittance for the incident angle of the light beam is The Tp component and the Ts component can be expressed by the longitudinal wave component and the transverse wave component ψ1 by the incident angle and ψ2 by the outgoing angle, respectively. The transmittance is T = (Tp + Ts)
/ 2.

In the present embodiment, the strobe light emitting portion window 5 employs acrylic, which is a commonly used material. The transmittance of the light beam with respect to the incident angle of the strobe light emitting unit window 5 made of acrylic is as shown in FIG.

If the angle θ between the strobe light emitting unit window 5 and the optical axis of the photographing lens is 60 °, and if the transmittance is to be 0.91 or more, FIG. The maximum incident angle with respect to the strobe light emitting unit window 5 is 61 °. Here, considering the vertical asymmetry of the reflector 6, the angle between the strobe light emitting unit window 5 and the optical axis of the photographing lens is 60.
゜ or more is desirable.

As a countermeasure against the vertical asymmetry of the reflector 6 and the reduction in the transmittance of the strobe light emitting window 5, the upper and lower thicknesses of the strobe light emitting window 5 are changed to form a prism.
There is a method of refracting the light beam emitted from the xenon tube 7 and guiding the light beam to the lower side of the screen. However, since the color temperature of the light beam emitted from the xenon tube 7 is adjusted by the strobe light emitting unit window 5, the upper and lower When the thickness changes, the color temperature changes vertically. When the prism effect is provided, the refraction angle varies depending on the wavelength. Therefore, the strobe light emitting unit window 5
It is desirable that the angle θ between the camera and the photographing lens optical axis is 60 ° to 75 °.

As described above, according to the built-in flash light emitting device of the single-lens reflex camera of this embodiment, the flash device 2
0 is stored above the taking lens barrel cover 1a and in front of the pentaprism 3, and is rotated by a shaft (hinge part 10) at the upper front part of the taking lens barrel 2 to move to the upper front light emitting position. As a result, the height of the camera can be reduced as compared with the case where a strobe pop-up mechanism is provided above the pentaprism 3.

Further, since the strobe light emitting portion moves upward and forward of the camera, vignetting of the strobe light by the photographing lens barrel 2 can be prevented even in the closest shooting.

[Appendix] According to the embodiment of the present invention as described in detail above, the following configuration can be obtained. (1) In the built-in flash light emitting device of a single-lens reflex camera, the flash device is provided in front of the pentaprism, avoiding the pentaprism, and can be moved between a protruding light emission position and a storage position stored in the storage chamber. A light emitting unit, and a light emitting unit moving unit that rotates about an axis provided in front of the camera with respect to the light emitting unit so as to move the light emitting unit between the light emitting position and the storage position. A built-in flash light emitting device for a single-lens reflex camera.

(2) In the built-in flash light emitting device of the single-lens reflex camera, a storage room provided in front of the pentaprism avoiding the pentaprism, a light emitting unit for irradiating the subject with illumination light, and the light emitting unit are held. A light-emitting unit holding frame, and a light-emitting unit holding frame rotatably supported between a light-emitting position protruding from the storage chamber and a storage position housed inside the storage chamber, and when the light-emitting unit holding frame is in the storage position. A built-in flash light-emitting device for a single-lens reflex camera, comprising: a light-emitting portion moving means having a rotation axis provided in front of the light-emitting portion of the camera.

(3) The built-in flash device of the single-lens reflex camera according to the above (1) or (2),
The light-emitting unit is close to the front of the pentaprism in the storage position, and pivots around the axis at the light-emitting position to be separated from the pentaprism in front of and upward of the camera.

(4) In the built-in flash light emitting device of the single-lens reflex camera according to the above (1) or (2), the single-lens reflex camera has a lens frame for holding a photographing lens integrally fixed. The axis, which is the center of rotation of the light emitting unit moving means, is disposed above the lens frame.

(5) In the built-in flash light emitting device of the single-lens reflex camera according to the above (2), the flash light emitting device is attached to the light emitting portion holding frame so as to be exposed to the outside when in the storage position. It has a window through which the illumination light passes.

(6) In the built-in flash light emitting device of the single-lens reflex camera, a storage room provided in front of the pentaprism avoiding the pentaprism, a light emitting section for irradiating the subject with illumination light, and the light emitting section inside. And the light emitting portion is movable to a light emitting position protruding from the storage chamber and a storage position stored near the front of the pentaprism inside the storage chamber. A light-emitting unit holding frame rotatably supported about a rotation axis provided at a front position farther from the pentaprism than the position of the light-emitting unit when the light-emitting unit is located, A built-in flash light-emitting device for a single-lens reflex camera, comprising: a window portion attached to the light-emitting portion holding frame so as to be exposed to light, and through which light stored in the light-emitting portion is transmitted.

(7) In the built-in flash light emitting device of the single-lens reflex camera according to (2) or (6),
Further, there is provided an urging means for constantly urging the light emitting unit holding frame toward the direction of the light emitting position protruding from the storage chamber and mounted in the storage chamber.

[0052]

As described above, according to the present invention, it is possible to provide a built-in flash light emitting device of a single-lens reflex camera that does not cause vignetting of strobe light without increasing the external dimensions.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view on a vertical plane including a photographing optical axis when a strobe device is in a housed state in a single-lens reflex camera according to an embodiment of the present invention.

FIG. 2 is a central longitudinal sectional view on a vertical plane including a photographing optical axis when the strobe device is in a light-emitted state in the single-lens reflex camera according to the embodiment.

FIG. 3 is an enlarged cross-sectional view of a main part of the single-lens reflex camera according to the embodiment, in which a light-emitting portion of a strobe device is enlarged.

FIG. 4 is a diagram showing a transmittance characteristic of a light beam with respect to an incident angle of a strobe light emitting unit window in the single-lens reflex camera according to the embodiment.

FIG. 5 is a diagram showing an example of a central vertical cross section of a vertical plane including a photographing optical axis of a main part when the strobe device is in a housed state in a single-lens reflex camera to which a conventional pop-up strobe mechanism is applied.

FIG. 6 is a diagram illustrating an example of a central vertical cross section of a vertical plane including a photographic optical axis of a main part when the strobe device is in an up state in a single-lens reflex camera to which a conventional pop-up strobe mechanism is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Camera body housing 2 ... Photo lens barrel 3 ... Pentaprism 4 ... Strobe cover 5 ... Strobe light emission window 6 ... Reflector umbrella 7 ... Xenon tube 8 ... Strobe case 9 ... Guide groove 10 ... Hinge part 11 ... Strobe base DESCRIPTION OF SYMBOLS 12 ... Arm 13 ... Hinge part 14 ... Cam 15 ... Strobe spring 16 ... Strobe device locking part 17 ... Strobe device locking spring 18 ... Operation knob 19 ... Hook 20 ... Strobe device 30 ... Light emitting part

Continued on the front page (72) Inventor Yuji Kobayashi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industrial Co., Ltd. (72) Inventor Yasuo Asakura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd.

Claims (3)

[Claims] 1. A built-in flash light emitting device for a single-lens reflex camera, comprising: a storage room provided in front of the pentaprism avoiding the pentaprism; a light emitting position protruding from the storage room; A light-emitting unit movable to the stored storage position, and a light-emitting unit moving unit provided in the storage chamber to move the light-emitting unit between the light-emitting position and the storage position. Built-in flash light emitting device of single-lens reflex camera. 2. A built-in flash light emitting device of a single-lens reflex camera, comprising: a storage room provided in front of a pentaprism avoiding a pentaprism; a light-emitting unit for irradiating an object with illumination light; A light-emitting unit holding frame, which is rotatably supported at a light-emitting position protruding from the storage chamber and a storage position stored inside the storage chamber, and when the light-emitting unit holding frame is at the storage position. A built-in flash light emitting device for a single-lens reflex camera, comprising: a rotating shaft provided in front of the light emitting unit. 3. A built-in flash light emitting device for a single-lens reflex camera, comprising: a storage room provided in front of the pentaprism avoiding the pentaprism; a light-emitting unit for irradiating a subject with illumination light; And the light-emitting portion is movable to a light-emitting position protruding from the storage chamber and a storage position stored in front of the pentaprism near the pentaprism inside the storage chamber. A light-emitting unit holding frame rotatably supported about a rotation axis provided at a front position further away from the pentaprism than the position of the light-emitting unit when the light-emitting unit is in the position; A built-in flash light emitting device for a single-lens reflex camera, comprising: a window portion that is attached to the light emitting portion holding frame so as to be exposed to light, and a window portion through which illumination light of the light emitting portion is transmitted.