JP2002122910A - Light receiving device and stroboscopic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light receiving device in which an optical fiber is not inadvertently folded. SOLUTION: When a coupling and fixing member 6 is fixed by screwing a screw 13 in a screw hole 5 through the hole 12 of a fixed part 8 so that a sensor chip 3 with a light receiving sensor 2 on a base plate 4 may be covered with the main body frame 7 of the member 6, the tip part 1A of the optical fiber 1 guiding the light of a flash light emitting tube to the sensor 2 is aligned with the sensor axis of the sensor 2. The tip part 1A is fixed on the 1st fixing and holding part 8 of the frame 7 and the vicinity part of the tip part 1A is fixed at the upper end of a 2nd fixing and holding part 10 extending upward, whereby the sensor 4 side of the optical fiber 1 is held in an up-and-down direction in a somewhat curved state. The optical fiber 1 extended in an opposite direction from the part 10 is fixed at the leading end of a 3rd fixing and holding part 11 extended in a horizontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-receiving device for detecting the amount of light emitted from a flash discharge tube by guiding the light emitted from the flash discharge tube to a light-receiving sensor mounted on a printed circuit board via an optical fiber. In particular, there is provided a connecting and fixing member for connecting and fixing the other end of the optical fiber into which light emission enters from one end and the light receiving sensor via a printed circuit board so that only the light emission enters the light receiving sensor. The present invention relates to a light receiving device provided and a strobe device incorporating the light receiving device.

[0002]

2. Description of the Related Art A light-receiving device including a light-receiving sensor mounted on a printed circuit board for receiving light emitted from a flash discharge tube via an optical fiber, and a light-receiving amount of the light-receiving sensor in the light-receiving device, For example, a strobe device that controls the amount of emitted light based on a comparison with an appropriate reference level is conventionally known.

For example, Japanese Utility Model Laid-Open Publication No. Sho 61-121432 discloses that a photodetector for detecting a flash light amount of a flash discharge tube is arranged at a position away from the flash discharge tube, and a part of the flash light of the flash discharge tube is used. There is disclosed a strobe device having a configuration in which a light guide leading to the light receiver is provided.

[0006] Here, the light guide installation structure will be described. The flash light incident end is located near the electrode portion of the flash discharge tube, and the guide receiver provided on a transparent plastic that can guide the flash light. 2 shows an example in which the flash light emitting end is held by a guide holding frame fixed to a mounting board so as to cover the light receiving element.

[0005] In the proposed device, since the light receiver is arranged at a position away from the flash discharge tube by guiding the flash light to the light receiver by the light guide, electric noise generated at the start of the flash light emission is reduced. It is difficult to ride on the output of the device, it can prevent malfunction due to electrical noise, and since the receiver can be arranged on the mounting board, the connection line between the receiver and the mounting board can be shortened or eliminated,
This is also advantageous in that the electrical noise does not enter through the connection line.

[0006]

The above-mentioned proposed device has resistance to electric noise. However, when the connection structure of the light guide to the light receiver provided on the mounting board is examined in detail. The light guide is fixedly held by the holding frame, in other words, the light guide is fixedly held at one point of the tip.

For this reason, when a small-diameter optical fiber is used as the light guide, there is a possibility that the light guide may be broken due to an external force.

In particular, in recent years, there has been a strong demand in the electric equipment field,
Strobe devices are not exceptional.
Since the degree of freedom of the space for arranging the light guide in the strobe device becomes small in relation to the arrangement position of the mounting board and other electric and mechanical parts, it is absolutely necessary to bend the light guide. External force may be applied to the light guide due to contact with itself or other parts.

When an external force is applied, the light guide bends around the tip portion which is fixed and held, and stress concentrates on this tip portion. Therefore, depending on the magnitude of the external force applied, the light guide may be bent. Inconvenience that the tip is broken at or near the tip will occur.

The invention according to the present application has been made in consideration of the above-mentioned disadvantages, and provides a light receiving device in which an optical fiber is not carelessly bent and a strobe device incorporating the light receiving device. With the goal.

[0011]

According to a first aspect of the present invention, there is provided a light guide that emits light from a light emitting portion incident on the other end to one end and guides the light to a light receiving sensor on a substrate. A light guide holder attached to the substrate, which is attached so as to shield light, and fixes one end side of the light guide at a plurality of positions in a length direction,
The light guide holding body includes a first fixing portion that fixes a front end portion of the light guide in accordance with a sensor axis of the light receiving sensor, and a position that is separated from the first fixing portion along the sensor axis direction. A light receiving device comprising at least a second fixing portion for fixing the vicinity of the tip of the light guide.

According to a second aspect of the present invention, in the first aspect, the light guide holder is configured to fix one end of the light guide extending from the first fixing portion through the second fixing portion. And the third fixing portion is provided in accordance with a drawing direction of the light guide.

According to a third aspect of the present invention, in any one of the above-mentioned inventions, the second fixing portion of the light guide holding member includes a tip portion of the light guide attached to a tip portion of an extension portion extending in a sensor axis direction of the light receiving sensor. The vicinity is fixed.

According to a fourth aspect of the present invention, in any one of the above aspects, the second fixing portion of the light guide holder has a contact surface of the light guide inclined toward the first fixing portion. Features.

In a fifth aspect based on the fourth aspect, the light guide holder holds the light guide in a state where the light guide is slightly curved between the first fixed portion and the second fixed portion. It is characterized by having.

According to a sixth aspect of the present invention, in any one of the above aspects, the light guide is an optical fiber.

According to a seventh aspect of the present invention, there is provided a strobe comprising the light receiving device according to any one of the above inventions, wherein the light emitting section is a flash discharge tube, and the amount of light emitted from the flash discharge tube is detected by the light receiving sensor. apparatus.

As described above, one end of the optical fiber as the light guide is fixed and held at two or three points, including the tip, on the light guide holder, including the tip. Can be prevented from being concentrated.

[0019]

1 and 2 are exploded perspective views showing the vicinity of a connecting portion between an optical fiber 1 as a light guide and a light receiving sensor 2, which are main parts of a light receiving device according to an embodiment of the present invention. It is a partially assembled enlarged sectional view.

In this embodiment, the light receiving sensor 2 is
A rectangular sensor chip 3 together with peripheral circuits such as an amplifier circuit
And is mounted and fixed on the printed circuit board 4. A screw hole 5 is formed in the printed circuit board 4 near the sensor chip 3.

The connecting and fixing member 6 as a light guide holding member is integrally formed of a resin material.
, The first fixed holding portion 8, the second fixed holding portion 10,
The light receiving sensor 2 is covered with the main body frame 7 and shielded from the outside by fitting the main body frame 7 so as to cover the entire sensor chip 3.

First fixed holding section 8 in the present embodiment
Is formed by a cylindrical projection 8A having a small mounting hole 8B opposed to the light receiving sensor penetrating the main body frame 7. The optical fiber 1 has its tip 1A inserted into the mounting hole 8B. As shown in the enlarged sectional view of a part of the optical fiber 1, it is fixed to the main body frame 7 by fixing with an appropriate adhesive 14, and the sensor axis of the light receiving sensor 2 and the center of the tip 1 A of the optical fiber 1 are fixed. Align with the axis.

A screw insertion hole 12 is formed in the fixing portion 9 of the connection fixing member 6, and a screw 13 passing through the screw insertion hole 12 is screwed into the screw hole 5 provided in the printed circuit board 4. Thereby, the fixing portion 9 is fixed to the printed circuit board 4, whereby the connection fixing member 6 including the main body frame 7 is fixed to the printed circuit board 4.

On one side of the main body frame 7, a fixing portion 9 for forming a fixing structure with the printed circuit board 4 is formed, and a column-shaped second fixing holding portion 10 is opposed to the mounting hole 8B. It is erected.

The second fixed holding portion 10 has a tip holding portion 10A as a groove inclined at an upper portion on the side facing the mounting hole 8B.
Is formed, and the first held portion 1B in the vicinity of the distal end portion 1A of the optical fiber 1 is bonded and fixed by the adhesive 14 along the inclination of the distal end holding portion 10A, and the distal end portion of the optical fiber 1 is slightly curved by the inclination. It will be kept in the state where it was done.

Further, the second fixed holding portion 1 is
A third fixed holding portion 11 is provided which extends horizontally in the direction opposite to the mounting hole 8B with respect to 0.

The third fixed holding portion 11 has a substantially L-shape, and has a long side 11A integrally protruding from the main body frame 7 in a direction orthogonal to the second fixed holding portion 10. A short side 11B is provided in a horizontal direction above the distal end of the long side 11A so as to be orthogonal to the long side 11A. The short side 11B is attached to the mounting hole 8B and the second fixed holding portion. 10 are located on a substantially straight line.

Then, the optical fiber 1 is routed from the second fixed holding section 10 toward the short side 11B of the third fixed holding section 11, is brought into contact with a lower portion of the short side 11B, and is bonded and fixed by the adhesive 14. Let it. At this time, the second locked portion 1C farther from the first locked portion 1B when viewed from the distal end portion 1A is fixed to the short side portion 11B at substantially the same horizontal level as the first fixed holding portion 8. As a result, as shown in FIG. 2, it is held in a gentle curve between the second fixed holding unit 10 and the third fixed holding unit 11.

Since the light receiving device in the present embodiment is configured as described above, first, the three points of the distal end portion 1A, the first locked portion 1B and the second locked portion 1C of the optical fiber 1 are connected. The fixing member 6 is fixed to the first, second, and third fixing holding portions 8, 10, and 11 to form a unit, and then the unitized connection holding member 6 to which the optical fiber 1 is fixed is attached to the printed circuit board 4. By fixing the optical fiber 1 via the fixing portion 9, as shown in FIG. 2, the optical fiber 1 is attached with the tip thereof orthogonal to the light receiving surface of the light receiving sensor 2.

That is, in the present embodiment, a desired bending state can be obtained in advance by a bending operation using only two members of fixing the optical fiber 1 to the connection holding member 6 at three points including the distal end portion 1A. In addition, since a subsequent device manufacturing operation such as a fixing operation to the printed circuit board 4 can be performed in a state where the bending operation is performed in the desired bending state in advance, the bending operation to the desired bending state is performed by fixing only one tip portion. The stress generated due to bending can be dispersed as compared with the case where the configuration is performed in other words, in other words, the concentration of stress at the tip can be greatly reduced.

In addition, considering manufacture as a strobe device, the optical fiber 1 is previously bent to a desired bent state only by the two members of the optical fiber 1 and the connection holding member 6 irrespective of other components of the strobe device. In this respect, the work of setting the optical fiber 1 to a desired arrangement state in the strobe device can be simplified.

The first and second connection holding members 6
By setting the absolute positions of the fixed holding portions 10 and 11 with respect to the light receiving sensor 2 in consideration of the expected bending state of the optical fiber 1, specifically, the first and second fixed holding portions 1 are set.
The desired bending state can be obtained without causing stress concentration on the distal end portion 1A of the optical fiber 1 by appropriately setting the forming direction and the forming length of 0 and 11 in consideration of the desired bending state of the optical fiber 1. become.

FIG. 3 is a schematic sectional view of a strobe device incorporating the light receiving device of the above embodiment.

Referring to FIG. 3, a reflector shell main body mold B is disposed in a body outer mold A, a reflector umbrella D is disposed on the reflector shell main body mold B, and an optical panel E is disposed on the front surface of the reflector umbrella D. Further, a flash discharge tube C is disposed behind the reflector U. The light incident end 1x of the optical fiber 1 is
It is arranged in front of the reflector umbrella D and between the outer mold A of the main body and the optical panel E, and is bonded and fixed by a bonding portion Bx.

When the flash discharge tube E emits light, the optical panel E
, The direct light from the flash discharge tube C and the light reflected by the reflector D enter, and a part of the light travels through the optical panel E and reaches the light incident end 1x of the optical fiber 1 to receive light. It is led to the sensor 2.

[0036]

The light receiving device according to the present invention and the strobe device incorporating this light receiving device have a light guide holding a light guide at a plurality of points, such as two or three points including one end of an optical fiber as a light guide. Since the optical fiber is fixed to the body, the stress generated at the time of bending the optical fiber to a desired bending state can be dispersed, and the effect of preventing the occurrence of the inconvenience of breaking the optical fiber at the same time can be prevented. ing.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of an embodiment of a light receiving device according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a part of the relevant part.

FIG. 3 is a schematic sectional view showing a strobe device incorporating the light receiving device of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 optical fiber 2 light receiving sensor 3 sensor chip 4 printed board 5 screw hole 6 connection fixing member 7 body frame 8 first fixing holding section 9 fixing section 10 second fixing holding section 11 third fixing holding section 12 screw insertion hole section 13 screw

Claims (7)

[Claims] 1. A light guide which emits light from a light emitting section incident on the other end side to one end side and guides the light to a light receiving sensor on a substrate. A light guide holder attached to the substrate for fixing one end of the guide at a plurality of locations in the length direction, wherein the light guide holder has a tip end of the light guide and a sensor axis of the light receiving sensor. And a second fixing portion for fixing the vicinity of the tip of the light guide at a position separated along the sensor axis direction with respect to the first fixing portion. Characteristic light receiving device. 2. The light guide holding body includes a third fixing portion that fixes one end side of the light guide extending from the first fixing portion through the second fixing portion, wherein the third fixing portion is provided. The light receiving device according to claim 1, wherein the light receiving device is provided in accordance with a direction in which the light guide is pulled out. 3. The light guide holder according to claim 2, wherein the second fixing portion fixes the vicinity of the front end of the light guide to the front end of an extending portion extending in the sensor axis direction of the light receiving sensor. Item 3. The light receiving device according to item 1 or 2. 4. The light guide holder according to claim 1, wherein the second fixing portion of the light guide holder has a contact surface of the light guide inclined toward the first fixing portion.
3. The light receiving device according to claim 1. 5. The light guide holder according to claim 4, wherein the light guide holds the light guide in a slightly curved state between the first fixing part and the second fixing part. The light receiving device according to the above. 6. The light receiving device according to claim 1, wherein the light guide is an optical fiber. 7. A light receiving device according to claim 1, wherein the light emitting section is a flash discharge tube, and a light emission amount of the flash discharge tube is detected by the light receiving sensor. Strobe device.