JP2002182276A - Electronic flash device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a small-sized electronic flash device that can provide wide- angle illumination even though an existing linear light emitting tube is used. SOLUTION: As for the electronic flash device provided with a flash light emitting part constituted of the linear light emitting tube having electrodes for emitting flash light at both ends, a reflector for reflecting the flash light emitted from the light emitting tube toward an object and a transmission window for covering the opening part of the reflector and also for transmitting the flash light, at least one of the electrodes of the light emitting tube is arranged outside the reflector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized flash device capable of performing wide-angle irradiation using an existing flash tube.

[0002]

2. Description of the Related Art A xenon discharge tube (hereinafter, referred to as a strobe device) is used.
In the case of using a straight luminous body (such as described as a Xe tube), the Xe tube was housed in the back of the reflector. FIG. 10A is a schematic diagram showing a cross section of a conventional flash light emitting unit 1. A transmission window 2 having a transmission plate on the front side and holding portions at both ends thereof reflects the emission of strobe light forward and closes an opening of a substantially box-shaped main body 3 containing a reflector 4 for distributing light. A luminous tube (Xe tube) 5 formed in a straight tubular shape for performing strobe light emission is attached to the back surface 4a of the reflecting umbrella 4. The Xe tube as the luminous tube 5 emits light by applying a trigger voltage.

FIG. 10B is a schematic view showing a cross section of an arc tube 5 using an Xe tube. Terminals 5a and 5b of a cathode 6 and an anode 7 protrude from both ends in the longitudinal direction of the arc tube 5, and a cathode 6 and an anode 7 for performing discharge are provided inside the arc tube 5. Then, a discharge is performed between the two electrodes of the cathode 6 and the anode 7, and the length of a portion that emits light during the discharge is called an arc length. Hereinafter, the length is described as L. In order to cause the Xe tube to emit light, it is necessary to provide a trigger electrode within the range of the arc length L. In this case, the reflector 4 is made of a conductive material, and the reflector 4 is used as a trigger electrode.
Contact within the arc length L of the tube.

Further, in order to efficiently perform strobe light emission, the entire range of the arc length is arranged inside the reflector 4 so that the reflector side walls 4b and 4c are located near the respective electrodes.

On the other hand, in flash photography using a wide-angle photographing lens, the flash emission requires a wide-angle light distribution characteristic for irradiating the entire subject. In order to achieve wide-angle irradiation in the horizontal direction, both side walls 4b and 4c of the reflector 4 must be widened and opened from the back 4a toward the front.

When the side walls 4b and 4c of the reflector are widened and opened so as to irradiate a wide angle in the horizontal direction without changing the longitudinal dimension of the reflector back part 4a, the strobe light emitting portion becomes considerably large. Alternatively, if the size of the arc tube 5 is reduced in accordance with the downsizing of the back surface portion 4a, there arises a problem that the amount of strobe light is insufficient. It has been difficult to downsize a strobe device for wide-angle photography while securing a sufficient amount of strobe light emission.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a strobe device in which a portion of a light emitting tube having the largest amount of light is located in a reflector and which can be reduced in size while using an existing light emitting tube.

[0008]

According to the first aspect of the present invention,
A straight tube light emitting tube having electrodes for strobe light emission at both ends, a reflecting umbrella for reflecting the strobe light emitted from the light emitting tube to the subject side, and a transmission for covering the opening of the reflecting umbrella and transmitting the strobe light. In a strobe device provided with a strobe light emitting portion including a window, the strobe light emitting portion has at least one electrode of the arc tube arranged outside the reflector.

The invention according to claim 2 is the invention according to claim 1, characterized in that the longitudinal length of the bottom inner wall surface of the reflector is shorter than the length of the light emitting portion of the arc tube. is there.

According to a third aspect of the present invention, in the strobe light emitting unit, the cathode of the light emitting tube is disposed near the cathode side end of the reflecting surface of the inner wall surface of the reflector bottom in the longitudinal direction of the light emitting tube. The invention according to claim 1 or 2 is characterized in that:

According to a fourth aspect of the present invention, the strobe light emitting section is characterized in that a distance from a cathode tip of the reflector bottom reflecting surface to the reflector side wall is x, and an anode tip of the reflector bottom reflecting surface. And the distance from the reflecting umbrella side wall surface to y,
When the distance between the cathode and the anode of the arc tube is L, and the length in the longitudinal direction of the reflection surface of the inner wall surface of the reflector bottom is W, | x | ≦ y (where y> 0) − 0.01L ≦ x ≦ 0.1L 1.1x / L + 0.69 ≦ W / L <1 (where x and y indicate positive or negative values corresponding to the outside and inside of the reflector). 2. An arrangement satisfying the conditional expression.
The present invention relates to any one of the inventions of (1) to (3).

According to a fifth aspect of the present invention, in the strobe light emitting section, the distance from the cathode tip of the reflector bottom reflecting surface to the reflector sidewall is x, and the anode tip of the reflector bottom reflecting surface is x. And the distance from the reflecting umbrella side wall surface to y,
When the distance between the cathode and the anode of the arc tube is L, and the length in the longitudinal direction of the reflection surface of the inner wall surface of the reflector bottom is W, | x | ≦ y (where y> 0) − 0.01L ≦ x ≦ 0.052L 2.4x / L + 0.78 ≦ W / L <1 (where x and y indicate positive or negative values corresponding to the outside and inside of the reflector) 2. An arrangement satisfying the conditional expression.
The present invention relates to any one of the inventions of (1) to (3).

According to a sixth aspect of the present invention, there is provided a straight tubular light emitting tube for emitting a strobe light, a reflector for reflecting the strobe light emitted from the light emitting tube toward a subject, and a strobe for covering the opening of the reflector. In a strobe device having a transmission window through which light is transmitted, a projection is provided inside the reflector so as to contact and position an edge of the arc tube.

[0014]

FIG. 1 is a front view of a lens-equipped film unit 10 using a strobe device of the present invention.
FIG. 2 is an exploded perspective view of the film unit 10 with a lens. The film unit with lens 10 is configured to be loaded with a photographic film in advance, so that the user can immediately take a picture. The film unit with lens 10 is assembled so that the front cover 11 and the rear cover 18 cover the unit body 17 from front and rear, respectively. A photographic lens 12 is located at the front center of the front cover 11, a finder window 15 is provided above the photographic lens 12, and a flash emission window 16 is provided near the finder window 15. Below the strobe light window 16, a strobe switch 13 for switching on / off strobe light is slidably mounted in the longitudinal direction of the film unit with lens 10. A release button 14 is provided on the upper surface of the film unit 10 with a lens.

The unit main body 17 holds a film, and mounts each photographing mechanism such as a shutter unit, a strobe unit 20, and a winding mechanism. Unit body 17
The flash unit 20 mounted on the flash device includes a flash board 21 on which a flash circuit is formed, and a switch piece 22 for switching the flash circuit on and off is provided on the front surface of the flash board 21. Switch piece 22
An operation piece 23 constituting the strobe switch 13 is superimposed on (in front of the film unit with lens 10), and the operation piece 23 is held together with the strobe unit 20 by attaching the front cover 11 to the unit body 17. The unit body 17 can slide freely in the longitudinal direction.

Switch piece 22 on which operation piece 23 is superimposed
When the operation piece 23 is located at the left end of the long hole 24 of the front cover 11, it does not come into contact with the contact portion provided on the strobe board 21, and is in an open state, and the strobe circuit is also turned off. When the operation piece 23 is slid to the right end of the elongated hole 24, the operation piece 23 pushes down the switch piece 22 to make contact with the contact portion on the strobe board 21 to turn on the strobe circuit.

FIG. 3 is an exploded perspective view of a strobe light emitting section 30 constituting the strobe unit 20. The strobe light emitting section 30 includes a light emitting section main body 31, a light emitting tube 5 (Xe tube), a reflector 33, a transmission window 34 through which strobe light is transmitted, and a connection conductor 35 conducting to an electrode of the light emitting tube 5. And a trigger conductor 36 for applying a trigger voltage.

The light emitting tube 5 is a straight tube-shaped Xe tube described as the conventional strobe light emitting unit 1, and terminals 5a and 5b are attached to both ends thereof. here,
Terminal 5a is connected to cathode 6 and terminal 5b is connected to anode 7 inside arc tube 5.
In the following description, an example in which the strobe unit is connected will be described. However, the same operation and effect can be obtained even when the strobe unit is configured so that the arrangement of the cathode and the anode is reversed.

The light emitting section main body 31 has a substantially box shape and is configured to open to the front side. The light emitting tube 5 and the reflecting umbrella 33 are housed therein. In addition, insertion holes 30a and 30b through which the arc tube 5 is inserted are formed on both side walls of the light emitting section main body 31, and insertion holes 30c through which the distal end portion 36a of the trigger conductor 36 is inserted are formed on the back side. . In the vicinity of the insertion hole 30a, there is provided a concave portion for fitting the distal end of the connection conductor 35, a conductor holding portion 32 for holding the connection conductor 35, and a conductor holding portion 35a for holding an intermediate portion of the connection conductor 35. , 35b are provided. Conductor holder 35a
Has a claw for retaining and locks the connection conductor 35 to position and fix it in the front-rear direction. Further, the conductor holding portion 35b is positioned and fixed in the left-right direction by sandwiching the connection conductor 35 in the groove.

The reflector 33 is made of a thin plate made of aluminum or the like, which is conductive and has a reflective surface with a high reflectivity, and reflects the strobe light forward. The reflection surface is formed on the inner wall surface. From the upper side of the opening of the reflecting umbrella 33, which is opened in a substantially rectangular shape,
The shape of the reflecting surface from the back to the lower side of the opening forms a smooth parabolic reflecting surface. In addition, insertion portions 33a and 33b through which the arc tube 5 is inserted are provided on both side walls, and are formed so as to expand from the back of the reflector 33 toward the opening. Further, the trigger conductor 36
Is contacted within the arc length of the arc tube 5 and functions as a trigger electrode.

The reflector 31 is accommodated in the light-emitting portion main body 31 with its opening facing forward, the front thereof is closed by a transmission window 34, and the reflector 33 is fixed.
The first insertion hole 30b, the insertion part 33b of the reflector 33, the insertion part 33a, and the insertion hole 30a of the light emitting part main body 31 are inserted in this order and attached to the light emitting part main body 31. Further, the connection conductor 35 is connected to the conductor holding portion 32 and the conductor holding portions 35a and 35b.
When the light emitting tube 5 is held, the light emitting tube 5 is urged by the connection conductor 35 from the rear, pressed against the front of the inner wall surface of the insertion hole 30a, and locked to the light emitting unit main body 31.

The strobe light emitting section 30 is mounted on the upper right of the strobe board 21 as shown in FIG.
The terminal 5b protruding from the strobe is soldered in a state of being in contact with a contact piece provided on the strobe board 21 and connected to a strobe circuit. Also, the connection conductors 35 and the trigger conductors 36 are locked at the edges of the conductors to the strobe board 21 by soldering or the like, and are connected to the strobe circuit.

In order to make the most effective use of the light emitted from the arc tube 5, all the light emitting parts (within the range of the arc length) are accommodated inside the reflector.
When the size of the reflector is reduced, the shape and size of the reflector are limited due to a problem of a space for mounting a strobe light emitting unit and a securing of a strobe irradiation range.
In some cases, it is not possible to put all of the light emitting parts of the reflector in the reflector. The present inventor studied how to obtain a small-sized strobe device without reducing the light emission amount.

FIG. 4 is a schematic diagram showing a schematic cross-sectional shape of a reflector 33 for a wide-angle strobe device capable of irradiating a wide range. As shown in FIG. 4 (A), reflection surfaces 41 and 42 are provided on both side walls (inner wall surfaces) of the bottom 40 which is the back surface of the reflection umbrella 33.
Are respectively provided, and the length in the longitudinal direction of the inner wall surface of the bottom 40 (the width of the reflection surface) is represented by W. FIGS. 4B and 4C show a state in which the arc tube 5 is inserted through the reflector bottom 40, and the width W of the bottom 40 is reduced, so that the arc tube 5 is formed.
The state where both ends protrude from the reflecting umbrella 33 is shown. FIG. 4B shows the amount of the cathode 6 protruding from the boundary 40 b between the reflecting surface 40 a and the reflecting surface 42 on the inner wall surface of the bottom 40 as x, and FIG. 4C shows the reflecting surface on the inner wall surface of the bottom 40. The amount of the anode 7 protruding from the boundary portion 40c between the reflection surface 42a and the reflection surface 42 is represented by y. Both x and y are distances parallel to the longitudinal direction of the arc tube 5.

In this case, the arc tube 5 shown in FIG.
Is L = W + x + y. This indicates that the width W of the bottom of the reflector is smaller than the light emitting portion of the light emitting tube 5. As described above, when all the light emitting portions of the arc tube 5 cannot be accommodated inside the reflector, an effective positional relationship between the reflecting surface that irradiates the strobe light emission amount as much as possible and the arc tube 5 is experimentally obtained. The relationship represented by the conditional expression was derived. | X | ≦ y (where y> 0) −0.01L ≦ x ≦ 0.1L 1.1x / L + 0.69 ≦ W / L <1 Here, as shown in FIG. Is a boundary portion 4 which is an end of the reflection surface on the cathode 6 side of the inner wall surface of the bottom portion 40 of the reflector 33
With 0b as the origin 0, the direction is a positive direction toward the outside of the reflector 33 in parallel with the arc tube 5, and a negative direction toward the inside of the reflector 33. When x is a positive value, the cathode 6 protrudes outside from the reflection surface 42 side and is located outside the reflector 33.

As shown in FIG. 4C, y is parallel to the arc tube 5 with the origin 40 at the boundary 40c which is the end of the reflection surface on the anode 7 side of the inner wall surface of the bottom 40 of the reflector 33. The umbrella 33 has a positive direction toward the outside and the umbrella bottom 4
0, the direction is negative.

The straight tube Xe tube emits a large amount of light in the vicinity of the cathode as compared with the other portions. In order to make effective use of this portion, the cathode 6 is disposed on the inner wall surface of the bottom 40 at the end of the reflection surface on the cathode 6 side. It is effective to approach. When x becomes smaller than −0.01 L, the range of the strong light amount near the cathode 6 becomes the reflector 33.
, The reflection surface near the reflection surface 42 of the reflection umbrella 33 cannot be used effectively, resulting in insufficient light quantity. If x is larger than 0.1 L, the range where the amount of light near the cathode 6 is strong will be outside the reflector 33, and the amount of strobe light will be insufficient.

When W / L is smaller than 1.1 × / L + 0.69, the arc length of the arc tube 5 located outside the reflector increases, and strobe light emission (irradiation of strobe light) is performed.
The number of unused parts increases, resulting in insufficient flash light. Further, when W / L becomes 1 or more, the width W of the bottom of the reflector becomes large, and it becomes impossible to design the reflector to be compact.

Next, an example in which the amount of light is actually compared using an Xe tube will be described. 5 to 7 are schematic diagrams showing the positional relationship between the reflector and the arc tube inserted through the reflector.
Each reflector shown in these figures has the same material and shape as the reflector 33 except that the width W of the reflector bottom is different, and has the same operational effects as the characteristics such as the irradiation range. . FIGS. 5 to 7 show schematic shapes of the cross sections. 52 is a cathode of the arc tube (Xe tube) 51, and 53 is an anode of the arc tube 51.

FIG. 5 shows a case where the arc length L of the arc tube 51 and the width W of the bottom of the reflector 50 are the same. For example, L = W =
It was 13.5 mm. At this time, the amount of light emitted in front of the reflector 50 is set to a reference value (100%), and the guide number (a predetermined numerical value indicating the distance of light at the center of the irradiation range) at this time is set to 5.0. .

FIG. 6 illustrates an example in which arc tubes L having an arc length L of 13.5 mm are used for reflectors having different bottom widths W. In each case, the arc tube 51 is arranged with respect to the reflector so that x = y, and the cathode 5
2 and the anode 53 are taken out of the reflector by the same distance. In the reflector 50a shown in FIG.
8 mm, and the position of the arc tube 51 is such that x and y are each 0.35 mm. In this case, the amount of strobe light emitted from the reflector 50a is 98% of that of the reflector 50 in FIG. 5, and the guide number is 4.95.
Irradiation with strobe light is performed in almost the same manner as in the case of the arrangement as shown in FIG.

The reflector 50b shown in FIG.
1 mm, x and y were each set to 0.7 mm. At this time, the light amount was 96%, and the guide number was 4.
It becomes 9. In the reflector 50c shown in FIG.
5 mm, and x and y were each 1.0 mm. At this time, the light amount was 94% and the guide number was 4.
It becomes 85. In the reflector 50d shown in FIG.
8 mm and x and y are each 1.35 mm. In this case, the light amount is 92% and the guide number is 4.8.

FIGS. 6A, 6B, 6C and 6D show both ends of the arc length L of the arc tube 51 outside the reflector, and the length of W is represented by (A), (B) and (B). (C) and (D) are shortened in this order, and it can be seen that the light amount and the guide number naturally become smaller as the arc length that fits in the reflector becomes shorter. Here, since x and y are the same distance, it indicates the amount of light when the center of the light emitting part (center of the arc length) is positioned at the center of the reflector. At this time, the ratio W / L (L of the arc tube 51 is 13.5 mm) of the length W in the longitudinal direction of the bottom of each reflector and the length (arc length L) of the light emitting portion of the arc tube 51 is obtained as follows. A) 0.95 for the reflector 50a, (B) 0.9 for the reflector 50b, 0.85 for the reflector 50c, and 0.8 for the reflector 50d.

Next, of the arc length L of the arc tube 51, when the cathode 52 side is close to the reflector, x is 0 mm (| x | ≦
y will be described with reference to FIG. The reflecting umbrella 50e shown in FIG.
m, and y is 2.0 mm, which is the same light quantity 98 as that of the reflector 50a shown in FIG.
%, And the guide number is 4.95. FIG.
The reflecting umbrella 50f of (B) has W of 10.7 mm and y of 2.
8B, the same light amount 9 as that of the reflector 50b in FIG.
6%, guide number 4.9. FIG.
In the reflector 50g of (C), W is 10.1 mm and y is 3.
The light amount is 94% and the guide number is 4.85, which is the same as that of the reflector 50c in FIG. 6C. The reflector 50h in FIG. 7D has W of 9.3 mm and y.
Is set to 4.2 mm, and the reflector 5 shown in FIG.
The light amount is 92%, which is the same as 0d, and the guide number is 4.8.

The W / L is calculated for the reflectors 50e, 50f, 50g, and 50h. (A) 0.85 for the reflector 50e, (B) 0.79 for the reflector 50f, and 0.2% for the reflector 50g. 75 (D) The reflection umbrella 50h is 0.69.

Here, each reflector shown in FIG. 6 and each reflector shown in FIG. 7 will be compared. Comparing, for example, the W / L of the reflector 50a and the reflector 50e having the same light amount and guide number, the reflector 50e is smaller (the reflector 50b
The reflecting umbrella 50f for the reflecting umbrella 50c and the reflecting umbrella 5 for the reflecting umbrella 50c
0g, and the same applies to the reflector 50h with respect to the reflector 50d). Since the same arc tube 51 is used and the value of L is the same, it can be seen that the arrangement shown in FIG. 7 can obtain the same light amount while further reducing the longitudinal width W of the bottom of the reflector. From this, the cathode 52 of the arc tube 51
It can be seen that when the light source is disposed near the end of the reflection surface of the inner wall surface of the reflector, a sufficient amount of strobe light can be obtained while further reducing the size of the reflector.

In contrast to the arrangement of the reflector and the arc tube 51 described above, of the arc length L of the arc tube 51, the anode 53 side is arranged near the reflecting surface 42 in the reflector, and y is 0 mm ( | X | ≦ y is not satisfied) is shown in the schematic diagram of FIG. FIG. 8 shows x for the reflector 50i shown in FIG.
Is 2.0 mm, and the arc tube 51 is arranged so that y is 0.0 mm. The light quantity at this time is 90% as compared with that of FIG. 5, and the guide number is 4.75.
Becomes The reflector 50i is the same as the reflector 50c, and W is 11.5 mm (W / L is also 0.8
5).

When the anode 53 side of the arc tube 51 shown in FIG. 8 is brought close to the reflector (the condition of | x | ≦ y is not satisfied), the structure shown in FIGS. In comparison, the amount of light is clearly insufficient, and sufficient strobe irradiation cannot be obtained.

As can be seen from the examples shown in FIGS. 6 and 7, by setting the cathode of the arc tube near the end of the reflection surface of the inner wall surface of the bottom of the reflector so as to satisfy the above conditional expression, Even when the bottom width is reduced, the amount of light emitted by the reflector is 9
The guide number can be set to 2% or more and the guide number to 4.8 or more, and the light quantity can be sufficiently secured. Preferably, | x | ≦ y (where y> 0) −0.01L ≦ x ≦ 0.052L 2.4x / L + 0.78 ≦ W / L <1. The light quantity irradiated by the reflector can be 95% or more, and the guide number can be 4.9 or more.

FIG. 9 is a perspective view of the reflector 60, which is made of the same material and shape as the reflector 33.
FIG. 9 shows a schematic shape for explanation. The reflective umbrella 60 has a U-shaped notch at the rear end, and a portion surrounded by the notch is bent so as to protrude from the bent portion 60a into the reflective umbrella. FIG. 9A is a perspective view of the reflective umbrella 60 as viewed from the rear side, and FIG.
It is the perspective view seen from the opening part side. The bent portion 60a
Piece 60b bent from the umbrella 60 to the reflecting surface side of the umbrella 60
Are projections for positioning the arc tube 5 inserted in the reflector 60, which contact the edge of the arc tube 5 and
Positioning is performed in the longitudinal direction. Stop piece 60b
The arc tube 5 positioned by, for example, the reflector 6
The cathode 6 (shown in FIG. 10) is located on the side of the reflecting surface 0, and the anode 7 (shown in FIG. 10) is located inside the strobe light emitting portion so as to be located outside the reflector 60. When the reflector 60 is configured as a trigger electrode or the like applied to the arc tube 5, a recess is provided at the tip of the stopper 60 b, and the stopper 60 b contacts the edge of the arc tube 5. In this case, the terminal 5a is insulated.

As described above, when the cathode of the arc tube is arranged near the end of the reflection surface on the inner wall surface of the reflector, the arc length range of the arc tube is entirely smaller than when the cathode is arranged inside the reflector. Also, a sufficient amount of reflected light can be obtained. Therefore, when the shape, size, etc. of the reflector are limited due to reasons such as the mounting space of the strobe device, as described above,
The cathode of the arc tube is arranged near the inner wall surface of the reflector, that is, near the end of the reflecting surface, so that sufficient strobe light irradiation is performed. At this time, the anode of the arc tube protrudes outside the reflector.

In this case, the anode protruding from the outside of the reflector is placed in a direction having a sufficient space, for example, in the case of the lens-fitted film unit 10 shown in FIG. By arranging the reflector on the light emitting unit 30 (left side), it is possible to arrange the reflective umbrella on the side edge of the lens-equipped film unit 10 (right in FIG. 2). Can be configured.

In this embodiment, since the Xe tube is used as the arc tube, the case where the light amount on the cathode side is large from the light emission characteristics has been described. However, the cathode and anode described above may be reversed. In any case, the same operation and effect can be obtained by arranging the electrode having a large light emission amount near the end of the reflection surface on the inner wall surface of the bottom of the reflector.

[0044]

According to the strobe device of the present invention, since at least one electrode of the arc tube is arranged outside the reflector,
The longitudinal direction of the bottom inner wall surface of the reflector can be shortened.

According to the strobe device of the present invention, since the length in the longitudinal direction of the inner wall surface of the bottom of the reflector is shorter than the length of the light emitting portion of the straight arc tube, the width of the bottom of the reflector is reduced. Therefore, the size of the reflector that can perform wide-angle irradiation can be reduced.

According to the strobe device of the present invention, since the cathode of the arc tube is disposed near the cathode side end of the reflection surface of the inner wall surface of the bottom of the reflector, a sufficient amount of strobe light can be obtained while reducing the size of the reflector. Obtainable.

According to the strobe device of the present invention, the distance from the cathode tip of the reflector bottom reflecting surface to the reflector sidewall is x, and the distance from the anode tip of the reflector bottom reflecting surface to the reflector side is x. Assuming that the distance to the wall surface is y, the distance between the cathode and the anode of the arc tube is L, and the longitudinal length of the reflection surface of the inner wall surface of the reflector umbrella is W, | x | ≦ y (However, y> 0) −0.01 L ≦ x ≦ 0.1 L 1.1 × / L + 0.69 ≦ W / L <1 (where x and y are positive corresponding to the outside and inside of the reflector) Since the arrangement satisfies the above conditional expression, a light amount of 92% or more can be obtained as compared with the case where all the light emitting parts of the arc tube are used.

According to the strobe device of the present invention, the distance from the cathode tip of the reflector bottom reflecting surface to the reflector sidewall is x, and the distance from the anode tip of the reflector bottom reflecting surface to the reflector side is x. Assuming that the distance to the wall surface is y, the distance between the cathode and the anode of the arc tube is L, and the longitudinal length of the reflection surface of the inner wall surface of the reflector umbrella is W, | x | ≦ y (However, y> 0) −0.01L ≦ x ≦ 0.052L 2.4x / L + 0.78 ≦ W / L <1 (where x and y are positive corresponding to the outside and inside of the reflector) Since the arrangement satisfies the conditional expression, 95% or more of the light amount can be obtained as compared with the case where all the light emitting portions of the arc tube are used.

According to the strobe device of the present invention, since the projection for contacting and positioning the edge of the arc tube is provided inside the reflector, the arc tube is positioned with respect to the reflection surface of the reflector. A predetermined arrangement can be adopted.

[Brief description of the drawings]

FIG. 1 is a front view of a film unit with a lens using a strobe device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the lens-fitted film unit shown in FIG.

FIG. 3 is an exploded perspective view of a strobe light-emitting unit constituting the strobe device.

FIG. 4 is a schematic view of a reflector forming the strobe light emitting unit.

FIG. 5 is a schematic diagram showing a positional relationship between a reflector and an arc tube.

FIG. 6 is a schematic diagram showing a positional relationship between a reflector and an arc tube.

FIG. 7 is a schematic diagram showing a positional relationship between a reflector and an arc tube.

FIG. 8 is a schematic diagram showing a positional relationship between a reflector and an arc tube.

FIG. 9 is a perspective view showing a schematic shape of a reflector.

FIG. 10 is a schematic diagram showing a conventional flash light emitting unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strobe light-emitting part 2, 34 Transmission window 3 Main body 4, 33, 50, 60 Reflector 5, 51 Emission tube 6, 52 Cathode 7, 53 Anode 10 Film unit with lens 11 Front cover 12 Photo lens 13 Strobe switch 14 Release button DESCRIPTION OF SYMBOLS 15 Finder window 16 Strobe light emission window 17 Unit main body 18 Rear cover 20 Strobe unit 21 Strobe board 22 Switch piece 23 Operation piece 24 Slot 30 Strobe light emission part 31 Light emission part main body 32 Conductor holding part 35 Connection conductor 36 Trigger conductor 40 Bottom 41 42 reflective surface

Claims (6)

[Claims] 1. A straight tube-shaped light emitting tube having electrodes for emitting strobe light at both ends, a reflecting umbrella for reflecting the strobe light emitted from the light emitting tube to a subject side, an opening of the reflecting umbrella, and a strobe. A strobe device comprising a strobe light emitting unit including a transmission window through which light is transmitted, wherein the strobe light emitting unit has at least one electrode of the arc tube arranged outside the reflector. 2. The strobe device according to claim 1, wherein a length in a longitudinal direction of a bottom inner wall surface of the reflector is shorter than a length of a light emitting portion of the arc tube. 3. The stroboscopic light emitting section, wherein the cathode of the arc tube is arranged near the cathode side end of the reflection surface of the inner wall surface of the reflector bottom in the longitudinal direction of the arc tube. Item 3. The strobe device according to item 1 or 2. 4. The strobe light-emitting unit is defined by a distance x from a cathode tip of the reflector bottom reflecting surface to the reflector sidewall, and a distance from the anode tip of the reflector bottom reflecting surface to the reflector sidewall. Where y is the distance between the cathode and the anode of the arc tube, L is the length of the reflecting surface of the inner wall surface of the bottom of the reflector, and W is the length of the reflecting surface. However, y> 0) −0.01 L ≦ x ≦ 0.1 L 1.1 × / L + 0.69 ≦ W / L <1 (where x and y are positive or negative corresponding to the outside and inside of the reflector) 2. The arrangement is such that the conditional expression is satisfied.
The strobe device according to any one of claims 1 to 3. 5. The strobe light-emitting portion, wherein a distance from the cathode tip of the reflector bottom reflecting surface to the reflector sidewall is x, and the distance from the anode tip of the reflector bottom reflecting surface to the reflector sidewall is Where y is the distance between the cathode and the anode of the arc tube, L is the length of the reflecting surface of the inner wall surface of the bottom of the reflector, and W is the length of the reflecting surface. However, y> 0) −0.01 L ≦ x ≦ 0.052 L 2.4 x / L + 0.78 ≦ W / L <1 (where x and y are positive or negative corresponding to the outside and inside of the reflector) 2. The arrangement is such that the conditional expression is satisfied.
The strobe device according to any one of claims 1 to 3. 6. A straight tube arc tube for performing strobe light emission,
In a strobe device provided with a reflecting umbrella for reflecting strobe light emitted from the luminous tube toward a subject and a transmission window for covering an opening of the umbrella and transmitting the strobe light, the luminous tube is provided inside the reflecting umbrella. A strobe device provided with a projection for contacting and positioning an edge of the strobe.