JPH10260458A - Flush light emitting device and camera provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of electrical leaking while miniaturizing a device by pressing a flush light emitting tube to a reflector by means of a pressing member and forming an electrode housing part covering the electrode of the end part of the flush light emitting tube on a device housing. SOLUTION: Both ends of a wire 10 being the pressing member are inserted in hole parts 3a and 3b above and below the reflector 3, so that the wire is attached to the reflector 3. When the Xe tube 2 is assembled in front of the reflector 3, the wire 10 abuts on the front surface of the Xe tube 2, is deviated to cause elastic force, and presses the tube 2 against the reflector 3. By using the wire 10 like this, a drawing member is dispensed with, so that a stroboscopic device can be miniaturized by the amount equivalent to the drawing member. Rib parts (electrode housing part) covering the tube 2 are formed on both ends of a stroboscopic housing 1. Thus, a creeping distance between the electrode and another metallic member in the vicinity of both ends of the tube 2 can be long, so that the electrical leaking from the respective electrodes to another metallic members can be surely prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to prevention of light emission failure of a flash device of a camera.

[0002]

2. Description of the Related Art In recent years, cameras with built-in automatic light-emitting strobes have become popular due to their ease of use. The strobe light emitting unit includes an elongated cylindrical Xe (xenon) tube as an arc tube, and a reflection shade covering the back side of the Xe tube to reflect light emitted from the Xe tube to the opposite side to the object side to the object side. And is configured. For the reflection shade, a plate material of Al (aluminum) whose surface is mirror-finished is used.
The Xe tube is made by filling a cylindrical glass tube with Xe gas, and plus and minus terminals are formed at both ends of the glass tube. The glass surface of the Xe tube is provided with a transparent conductive coating at the center except for the vicinity of both poles, and this coating is used as a trigger electrode.

In order to make the Xe tube emit light, a main capacitor charged to about 280 to 330 V is connected to both ends of the Xe tube, and a pulse voltage of several Kv is applied to the trigger electrode to excite the Xe gas inside the Xe tube. Then, the charging energy of the main capacitor is discharged through the Xe tube and converted into light energy.

As a means for applying a trigger voltage, a method is widely used in which a reflector is made of a metal member (aluminum), and the trigger is applied directly to the reflector by bringing the reflector into contact with the trigger electrode of the Xe tube. I have. In this case, if the reflection shade and the trigger electrode are not securely in contact with each other, the Xe gas is not excited even when the trigger voltage is applied, and the Xe tube does not emit light. Therefore,
In order to ensure that the Xe tube emits light, the state of contact between the reflector and the trigger electrode is important. Specifically, the contact resistance between the reflector and the trigger electrode must be several KΩ or less.

For this reason, in a conventional strobe device, an Xe tube having a trigger electrode portion is provided with a pulling force toward the reflector. As a drawing method, for example, as disclosed in Japanese Utility Model Publication No. Sho 61-18503, a band-shaped elastic member having holes at both ends is hooked to both ends of the Xe tube and passed through the back side of the reflection shade, and the elastic force of the elastic member is Some draw the Xe tube to the reflector.

By the way, when the size of the strobe device is reduced with the downsizing of the camera, the space inside the strobe device is reduced, so that the distance between the internal components, for example, the reflection shade and other conductive members is reduced. Therefore, the creepage distance between the trigger electrode and the reflection shade and other conductive members is reduced. When a high-voltage pulse of several kV is applied to the trigger electrode or the like in such a state, the dielectric breakdown of the internal space is caused, another electric part is discharged, trigger leak occurs, and the Xe tube may not emit light. .

Therefore, it is necessary to make the creepage distance as long as possible so as not to generate a trigger leak.
For example, conventionally, walls were formed around holes at both ends of the strip-shaped elastic member in order to prevent leakage from both ends of the Xe tube to other conductive members.

FIG. 5 shows a cross section of a conventional strobe light emitting section. In this figure, reference numeral 11 denotes a strobe housing (device housing) that holds a strobe light emitting unit. 12 is
An Xe tube that emits light to a subject. 13 is the Xe tube 1
2 is a reflection shade for reflecting the light emitted backward from the light emitted from the light source 2 toward the subject. At both ends of the Xe tube 12, a plus electrode 12a and a minus electrode 12b are formed. On the surface of the Xe tube 12, the above-described conductive coating 12c is applied. Since the conductive coating 12c is in contact with the reflector 13, the reflector 13 serves as a trigger electrode. Reference numeral 14 denotes a lead wire connected to the plus electrode 12a of the Xe tube 12, and reference numeral 15 denotes a lead wire connected to the minus electrode 12a of the Xe tube 12.

Reference numeral 16 denotes a drawing member made of an elastic material for bringing the conductive coating 12c of the Xe tube 12 into contact with the reflection shade 13. As shown in detail in FIG. 6, flange portions 16a and 16b are formed at both ends of the pulling member 16, and sealing materials 17 and 18 are sealed in the holes 16c and 16d as shown in the figure. Pulling member 1
6 is incorporated in the flash housing 11 as described above.
At this time, since the portion having the length L1 shown in FIG. 6 is shorter than the length L shown in FIG. 5, a pulling force corresponding to the difference between L and L1 is generated, and the Xe tube 12 becomes To the side, the conductive coating 12c and the reflective shade 13
Is pressed against.

Conventionally, when a photograph is taken using such a strobe device, the phenomenon that human eyes in the photograph become red, that is, the red-eye phenomenon has been a problem. This red-eye phenomenon is that when the strobe light-emitting part and the optical axis of the taking lens are close, the strobe light entering from the front of the subject's eye reaches the retina of the person's eye, causing the blood vessels on the retinal surface to glow red, The reflected red light is photographed through the photographing lens, and the subject's eyes appear bright red.

In order to reduce the red-eye effect, a flash pulse emission for a very short time is performed several times before photographing, the pupil of a person who is a subject is closed even a little, and photographing is performed before the pupil opens. A method to reduce the amount of strobe light that reaches the retina from the pupil during shooting, or to make the light emitting part of a lamp different from the strobe light emitting part emit before shooting, and close the pupil of the person who is the subject as much as possible , Take a picture before the pupil opens, or move the flash unit away from the optical axis of the shooting lens. (Lay out a fixed strobe away from the optical axis of the camera's shooting lens. Or move it to a remote location). When the above method is employed, a strobe device is configured as shown in FIG. In this figure, reference numeral 41 denotes a strobe housing for holding a strobe light emitting unit. An Xe tube 42 emits light to the subject. Reference numeral 43 denotes a reflection shade for reflecting light emitted backward from the Xe tube 42 toward the subject. 44
Is a red-eye reduction lamp. Reference numeral 45 denotes a pulling member that pulls the Xe tube 42 toward the reflection shade 43 side.

In such a strobe device, when the terminal 44a of the lamp 44 is close to the reflection shade 33, dielectric breakdown occurs between the terminal 44a and the reflection shade 43 serving as a trigger electrode, and trigger leak occurs. There is a risk.
Therefore, by providing the pulling member 45 with a rib portion 44a that covers the periphery of the lamp 44, the creepage distance from the reflector 43 to the lamp terminal 44a is increased, and trigger leak is prevented.

[0013]

However, if the structure of the strobe device as shown in FIGS. 5 and 7 is adopted, a space in the device for incorporating the drawing members 16 and 45 into the strobe housings 11 and 41 is required. However, there is a problem that the size of the camera is hindered.

[0014]

In order to solve the above-mentioned problems, according to the present invention, a flash arc tube is pressed against a reflector by a linear or band-like pressing member (elastic member) attached to the reflector. After that, an electrode housing for covering the end electrode of the flash tube is formed in the device housing. As a result, the creeping distance between the end electrode of the flash arc tube and another conductive member is increased while preventing the occurrence of electrical leakage, while reducing the size of the device by eliminating the need for the conventional drawing member.

According to the present invention, an electric component (for example, a red-eye reducing light emitting component) different from the flash arc tube is provided in the device housing.
By forming the component accommodating portion that covers the electronic component, it is possible to prevent the occurrence of electric leakage from the electrodes at both ends of the flash arc tube and the reflector to the electric component. By using these flash light emitting devices, the size of the flash light emitting device itself and the size of the camera using the flash light emitting device can be reduced because a large attracting member is not used unlike the related art.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 shows a strobe device (flash light emitting device) according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a strobe housing (device housing) for holding a strobe light emitting unit, which is formed of a non-conductive resin. Reference numeral 2 denotes a Xe tube that emits light to a subject, and a positive electrode 2a and a negative electrode 2b are provided at both ends of the Xe tube 2.
Are formed. Lead wires 4 and 5 are connected to the plus electrode 2a and the minus electrode 2b, respectively.
Reference numeral 3 denotes a reflection shade for reflecting the light emitted backward by the Xe tube 2 toward the subject, and is formed of a plate material of Al (aluminum) whose surface is mirror-finished.

On the surface of the Xe tube 2, except for the vicinity of both ends,
A conductive coating 2c is provided. Since the conductive coating 2c is in contact with the reflection shade 3, the reflection shade 3 becomes a trigger electrode of the Xe tube 2. Reference numeral 6 denotes a lead wire for applying a trigger voltage to the reflector 3 serving as a trigger electrode.

Reference numeral 10 denotes a metal wire (pressing member).
Both ends are attached to the reflector 3 by being inserted into upper and lower holes 3a, 3b of the reflector 3. Wire 10
When the Xe tube 2 is mounted on the front of the reflection shade 3, the Xe tube 2
The Xe tube 2 is pressed against the reflection shade 3 by generating elastic force by abutting against the front surface (surface on the subject side) of the Xe tube. By using the wire 10, the pulling member shown in FIG. 5 and the like becomes unnecessary, and the strobe device can be reduced in size accordingly.

At both ends of the strobe housing 1, there are formed rib portions (electrode accommodating portions) 1a and 1b for covering the plus electrode 2a and the minus electrode 2b of the Xe tube 2. Thereby, the other metal members (conductive members) 9a and 9 near both ends of the plus electrode 2a and the minus electrode 2b and the Xe tube 2 are provided.
The creepage distance between the electrodes 2a and 2b can be increased, and electrical leakage from the electrodes 2a and 2b to the other metal members 9a and 9b can be reliably prevented.

The strobe device thus constructed is attached to the camera body 20 as shown in FIG. As described above, the size of the strobe device is reduced, so that the size of the entire camera can be reduced.

(Second Embodiment) FIG. 4 shows a second embodiment of the present invention.
1 shows a strobe device according to an embodiment. In this figure, reference numeral 31 denotes a strobe housing for holding a strobe light emitting unit. Reference numeral 32 denotes an Xe tube that emits light to a subject. 3
Reference numeral 3 denotes a reflection shade for reflecting light emitted backward from the light emitted by the Xe tube 32 toward the subject. 35 is the first
A wire (pressing member) that is attached to the reflection shade 33 similarly to the wire 10 of the embodiment and presses the Xe tube 32 against the reflection shade 33.

Reference numeral 34 denotes a lamp for alleviating red eyes. A rib portion 31a is formed near the end portion of the strobe housing 31 (inside the portion corresponding to the rib portions 1a and 1b described in the first embodiment) to cover the light emitting portion of the lamp 34 and the base end portion of the terminal 34a. Have been. For this reason, the lamp 34 is close to the reflection shade 33, but since the base end of the lamp terminal 34a close to the reflection shade 33 is covered by the rib 31a, the distance between the reflection shade 33 and the lamp terminal 34a is increased. The creepage distance becomes longer, and leakage of the trigger voltage from the reflection shade 33 to the lamp terminal 34a is reliably prevented.

Note that the strobe device of the present embodiment also has
Similar to the Sotsu road book device of the embodiment, it is attached to the camera body, and contributes to downsizing of the camera.

In each of the above embodiments, the linear wire 10 is used as the pressing member. However, a band-shaped member having a width that does not affect the light emission of the Xe tube 2 may be used.

[0025]

As described above, according to the present invention,
Since the flash tube is pressed against the reflector by the pressing member attached to the reflector, the electrode housing is formed in the device housing to cover the end electrode of the flash tube.
It is possible to reliably prevent the occurrence of electric leakage from the end electrode of the flash arc tube to another conductive member while reducing the size of the device and the size of the camera provided with the device.

If a component housing for covering an electric component (for example, a light emitting component for red-eye reduction) different from the flash arc tube is formed in the device housing, the electric components can be transferred from the electrodes at both ends of the flash arc tube or the reflection shade to the electric component. Electrical leakage can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a strobe device according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of the strobe device.

FIG. 3 is a front view of a camera provided with the strobe.

FIG. 4 is a side sectional view of a strobe device according to a second embodiment of the present invention.

FIG. 5 is a plan sectional view of a conventional strobe device.

FIG. 6 is a perspective view of a pulling member of a conventional flash device.

FIG. 7 is a side sectional view of a conventional strobe device.

[Explanation of symbols]

 1, 31, 41: Strobe case 2, 12, 32, 42: Xe tube 3, 13, 33, 43: Reflector shade 2a: Positive electrode 2b: Negative electrode 2c, 12c: Conductive coating 6, 14, 15: Lead wires 34, 44: Red-eye reduction lamp 34a, 44a: Lamp terminal 16, 45: Pulling member

Claims (5)

[Claims] 1. A flash arc tube, a reflector, and a pressing member attached to the reflector to press the flash arc tube against the reflector. A flash light emitting device, wherein an electrode housing portion for covering an electrode is formed. 2. The flash light emitting device according to claim 1, wherein the pressing member is a linear or band-shaped elastic member that contacts the front surface of the flash arc tube. 3. The flash light emitting device according to claim 1, wherein a component housing for covering an electrical component different from the flash arc tube is formed in the device housing. 4. The flash light emitting device according to claim 3, wherein the electric component is a red-eye reduction light emitting component. 5. A camera comprising the flash light emitting device according to claim 1.