JP2001100371A - Method for fitting light receiving element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for fitting a light receiving element by which a light receiving surface can be directed to an object. SOLUTION: A film unit with a lens 1 is constituted so that the circuit board 44 of an electronic flash device is integrated between an exposure unit 2 and a film housing chamber 4b. Connection terminals 48b and 48c are inserted from the pattern surface 44a to the mounting surface 44b side of the board 44, bent and then inserted from the mounting surface 44b side to the pattern surface 44a side. Thereafter, they are soldered to a circuit pattern and the light receiving element 48 is fitted to the board 44. The element 48 is exposed from a photometry window 16 formed at a front cover 6 so as to measure the luminance of the object.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a light receiving element on a circuit board.

[0002]

2. Description of the Related Art As a simple camera, a film unit with a lens pre-loaded with an unexposed photographic film is manufactured and sold by the present applicant. There are various types of this film unit with lens depending on the application.
Among them, those incorporating a strobe device so as to enable photographing in a dark place such as at night or indoors are widely used.

A strobe device built in a film unit with a lens has circuit elements intensively arranged on one side of a strobe substrate and the other side has a space between the circuit elements in order to reduce the size and cost. It is a circuit pattern surface to be electrically connected. Then, the respective lead terminals of the circuit elements are inserted from the mounting surface side of the strobe substrate, and are fixed to the strobe substrate collectively from the circuit pattern surface side by a technique such as reflow soldering. The strobe substrate is incorporated between a main body base provided with a film and cartridge storage chamber and a front cover covering the front surface thereof. Then, the circuit element mounting surface of the strobe board is directed toward the unit main body so that the concave portion formed on the front side of the main body base can be effectively used as a storage space for the circuit element. The circuit pattern surface to be electrically connected faces the rear surface of the front cover.

By incorporating a strobe device as described above, it is possible to take a picture in a dark place, but in a film unit with a lens, the shutter speed and the aperture are fixed to reduce cost. ,
With respect to overexposure or underexposure on the negative film, a print photograph having substantially proper exposure can be obtained by a printing process. However, there is a limit to the exposure correction by the printing process, and it is difficult to correct an extreme over-negative or under-negative.

[0005] Under such circumstances, it has been studied to provide a simple automatic exposure control device for switching the shutter speed or the aperture between two steps based on a certain level of brightness, for example, for a film unit with a lens. . As described above, even if the two-step switching is performed, the exposure control is automatically performed, so that the overexposure or underexposure can be prevented. Appropriate print photos can be obtained.

[0006]

In providing an automatic exposure control device, a light receiving element for measuring the brightness of a subject is indispensable. However, a lens is required to secure a space for assembling the same and to omit troublesome wiring work. It is advantageous to solder to a strobe substrate incorporated in the film unit. However, as described above, the circuit element mounting surface of the strobe board is directed toward the base of the main body. Therefore, if the light receiving element is simply mounted on the strobe board together with these circuit elements, the light receiving surface faces the base of the main body. I will. Therefore, the light receiving element must be built into the main body base or front cover separately from the strobe board, and connected to the exposure control circuit formed on the strobe board with lead wires, etc., resulting in reduced work efficiency and, consequently, lower manufacturing costs. Will be expensive.

The present invention has been made in view of the above circumstances, and it is possible to directly solder a light receiving element for measuring the luminance of a subject to a strobe substrate and to make the light receiving surface of the light receiving element face the direction of the subject. It is an object of the present invention to provide a method for mounting a light receiving element.

[0008]

In order to achieve the above object, a method for mounting a light receiving element according to the present invention is characterized in that one surface is used for mounting a circuit element and the other surface is used for electrical connection of the circuit element. A circuit pattern surface on which a wiring pattern to be formed is formed, and the circuit pattern surface is mounted on a circuit board incorporated in the camera toward the object side, and a light receiving element for measuring light from the object is mounted on the back side of the light receiving element. After the extended connection terminal is inserted from the circuit pattern surface side to the mounting surface side, the connection terminal is bent, and the tip is inserted from the mounting surface side to the circuit pattern surface side and soldered to the circuit pattern surface.

Alternatively, one surface is a mounting surface of a circuit element,
The other surface is a circuit pattern surface on which a wiring pattern used for electrical connection of a circuit element is formed, and this circuit pattern surface measures light from the subject on a circuit board incorporated in the camera toward the subject. In the method of attaching a light receiving element, an opening for transmitting light from a subject is formed in the circuit board, a light receiving surface of the light receiving element is exposed to the subject side through the opening, and a connection terminal extending to a back side of the light receiving element is formed. It is bent and its tip is inserted from the mounting surface side to the circuit pattern surface side and soldered to the circuit pattern surface. It is preferable that the light receiving surface of the light receiving element protrudes toward the circuit pattern surface through the opening.

[0010]

FIG. 2 is an external perspective view of a film unit with a lens to which the present invention is applied, and FIG. 3 is an exploded perspective view thereof. The film unit 1 with a lens
A unit main body including a main body base 4 to which the exposure unit 2 and the strobe device 3 are assembled, a front cover 6 and a rear cover 7 placed in front and rear thereof, a cartridge 9 and a photographic film drawn out of the cartridge 9 into a roll form. 11

The cartridge 9 and the photo film 11 are
The lens-fitted film unit 1 is preliminarily incorporated into the cartridge storage chamber 4a and the film storage chamber 4b formed in the main body base 4 at the time of manufacture.

On the front surface of the front cover 6, a photographing window 12 exposing a photographing lens 36, a finder objective window 13, a protector 14, and a photometric window 16 exposing a light receiving element 48 are provided.
And a shutter button 18 and a film counter window 19 are formed on the upper surface. A power switch 17 is attached beside the photometric window 16. The light receiving element 48 is a photometric unit of an exposure control circuit described later, and in this embodiment, a Cds cell is used. As is well known, a Cds cell is a photoconductive element whose resistance value changes according to the luminance at which light is received. The exposure control circuit automatically switches the aperture using the change in the resistance value.

The power switch 17 is for starting flash charging, and is slidably provided in a vertical direction. When the charging of the strobe is completed, the charging completion lamp is turned on, and this light passes through the light guide 33 and is confirmed by the photographer. The power switch 17 is linked with a switch for activating the exposure control circuit. When the switch 17 is turned on, the exposure control circuit is activated and the light receiving element 4 is turned on.
8 is started.

A finder eyepiece window 21 and a charging completion confirmation window 22 are formed in the rear cover 7, and bottom lids 7a and 7b are formed integrally to cover the bottom openings of the cartridge storage chamber 4a and the film storage chamber 4b in a light-tight manner. Have been. Bottom lid 7a
Is opened when taking out the cartridge 9 in which the photographed film is taken.

A hoisting knob 23 is provided at the upper part of the cartridge storage chamber 4a, and a hoisting shaft integrally formed on the lower surface thereof engages with the spool of the cartridge 9. By rotating the winding knob 23 each time a photograph is taken, the photographed film 11 that has been photographed is stored in the cartridge 9 one frame at a time.
Get caught in The shutter mechanism incorporated in the exposure unit 2 is charged for the next photographing operation in conjunction with the winding of one frame of the film, and the winding lever 23 by the lock lever incorporated in the exposure unit 2 when one frame of the film is fed. Is locked.

An exposure frame 4c is formed on the main body 4 and limits the exposure range for one frame on the front surface of the photographic film 11 sent to the photographing position. A dark box base 4d protruding in a square tubular shape is integrally formed in front of the exposure frame 4c, and the exposure unit 2 is assembled to the main body base 4 to form a dark box in cooperation with the dark box section 26 on the exposure unit 2 side. .

The exposure unit 2 is based on a dark box section 26, which is assembled with a shutter mechanism, a film unwinding mechanism, a film counter plate, and the like, and furthermore, an objective lens 34 and an eyepiece (which constitute a finder optical system). (Not shown).

At the front of the dark box 26, a shutter opening 26 is provided.
a diaphragm plate 27, shutter blades 28, and a shutter cover 29 that covers them are attached in front of the aperture plate 27a. An electromagnet 35 is arranged on the right side of the dark box 26. The shutter cover 29 includes a photographing lens 36.
Is incorporated.

The shutter blade 28 is of a well-known kicking type, and when the shutter button 18 is pressed, the shutter mechanism operates to open and close the shutter opening 26a.
The shutter speed is fixed to a predetermined value set at the time of design.

The aperture plate 27 has a large aperture 27a and a small aperture 27b. The aperture plate 27 has an opening 27c attached to a shaft 31 provided in the dark box portion 26. With the shaft 31 as a central axis, a first position where the small stop opening 27b is inserted into the imaging optical path, It is rotatable between a second position where the large aperture 27a is inserted on the optical path. The small stop aperture 27b has a normal stop diameter, and the large stop aperture 27a has a larger diameter. An iron plate 30 is attached to one end of the aperture plate 27. The iron plate 30 is provided so as to be in contact with the electromagnet 35 when the aperture plate 27 is at the second position.

A spring 32 is attached to the diaphragm plate 27, and the spring 32 urges the diaphragm plate 27 to rotate to the first position. Electromagnet 35
Is attached to the circuit board 44, and the electromagnet 3
When the magnetic force of No. 5 reaches a predetermined value or more, the iron plate 30 is attracted while resisting the bias of the spring 32, and the diaphragm plate 27 is held at the second position.

The strobe device 3 has a circuit board 44 on which a circuit pattern is printed, and a strobe light emitting portion 49 composed of a strobe discharge tube, a reflector, and a protector 14, and a battery 50 for power supply. is there.
The circuit board 44 includes a main capacitor 46, a synchro switch 47, a booster coil, a light receiving element 48, and an electromagnet 3
5 and the like are attached to form various circuits. The light receiving element 48 is exposed to the outside from the photometric window 16 on the front surface of the front cover 6.

The circuit board 44 is provided with a charging circuit for boosting the voltage of the battery 50 to charge the main capacitor 46, and an exposure control circuit for switching the aperture. The exposure control circuit measures whether or not the subject brightness is equal to or less than a predetermined value by using the light receiving element 48, and when detecting that the subject brightness is equal to or less than the predetermined value, supplies power to drive the electromagnet 35 and The diaphragm plate 27 is rotated by the suction force. As a result, the diaphragm plate 27 rotates from the first position to the second position, and moves from the normal small aperture opening 27b to the large aperture opening 27.
Switch to a.

On the front surface of the circuit board 44, a switch connection piece 45 for starting flash charging and operating the exposure control circuit is attached. When the power switch 17 attached to the front cover 6 is slid to the ON position, the switch contact piece 45 becomes conductive, and power is supplied to each circuit.

FIG. 1 is a sectional view of a main part of the film unit 1 with a lens. A circuit board 44 is sandwiched between the film storage chamber 4b of the main body base 4 and the exposure unit 2 and is arranged in parallel with the front cover 6. ing. The front side of the circuit board 44 is a pattern surface 44a on which a circuit pattern is formed, and the rear side where there is room is mounted on which many of various electric components such as a capacitor 53, a transistor 54, and a transformer 55 are mounted. It is a surface 44b.

A method of attaching the light receiving element 21 to the circuit board 44 will be described with reference to FIG. The light receiving element 48 has a light receiving surface 56 provided on the front side of a substantially cylindrical element body 48a, and connection terminals 48b and 48c provided on the rear side of the light receiving surface 56.
Is provided. The light receiving element 48 is connected to the circuit board 44.
The connection terminals 48b and 48c before being attached to the device main body protrude linearly from the back side of the element main body 48a along the central axis of the element main body 48a. This connection terminal 48
b, 48c are attached to the mounting holes 44c opened in the circuit board 44.
Then, after being inserted from the pattern surface 44a side to the mounting surface 44b side, the connection terminals 48b and 48c are bent,
The connection terminals 48b and 48c are inserted into the mounting holes 44d at positions different from those described above, this time from the mounting surface 44b side toward the pattern surface 44a side. And, the tip portions of the connection terminals 48b, 48c protruding from the pattern surface,
A copper foil for forming a circuit pattern is soldered. Thereby, the light receiving element 48 is securely fixed to the circuit board 44, and the light receiving surface 56 is exposed from the light measuring window 16 of the front cover 6, so that the light of the subject can be measured.

Next, a second embodiment of the present invention will be described. This embodiment relates to a method of attaching a light receiving element to a circuit board of a strobe device incorporated in a film unit with a lens, similarly to the first embodiment described above, and uses the same components as those in the first embodiment. As for
The detailed description is omitted using the same reference numerals. FIG. 4 is an external perspective view of a strobe device 61 in which the light receiving element 48 is incorporated, and FIG. 5 is a sectional view of a main part thereof. As in the first embodiment, a circuit board 62 constituting the strobe device 61 has a front surface on a pattern surface 62a on which a circuit pattern is formed.
The rear side, where there is room for space, is a mounting surface 62b on which many of the various electrical components are arranged. Light receiving element 48
Is mounted on the mounting surface 62b side of the circuit board 62, and when viewed from the pattern surface 62a side, the light receiving surface 56 is exposed through an exposure hole 62c opened to match the light receiving surface 56.

A method of attaching the light receiving element 48 to the circuit board 62 will be described with reference to a sectional view of a main part shown in FIG. First, the light receiving element 48 is set from the mounting surface 62b side of the circuit board 62 so that the light receiving surface 56 is aligned with the exposure hole 62c, and then the connection terminals 48b and 48c are bent to make the circuit board 6
2, the connection terminals 48b and 48c are inserted from the mounting surface 62b toward the pattern surface 62a into the mounting holes 62d opened in FIG. Then, the tip portions of the connection terminals 48b and 48c protruding from the pattern surface and the copper foil forming the circuit pattern are soldered. Thereby, the light receiving element 48
Is securely fixed to the circuit board 62 and the light receiving surface 5
6 is exposed from the photometric window 16 of the front cover 6, and photometry of the subject can be performed.

In this embodiment, since the light receiving element 48 is mounted on the back side of the circuit board 62, the front cover 6
Even if the interval between the circuit boards 62 is narrow, it does not hinder the arrangement of components.

The second embodiment can be modified in various ways. As shown in the sectional view of the main part of FIG. The light receiving element 48 can be more firmly attached by being formed according to the outer diameter of the element 48a and fitting the element body 48a into the exposure hole 62c. In addition, by providing the condenser lens 65 on the front surface of the light receiving surface 56, a wide range of photometry can be performed. The condenser lens 65 is disposed so as to be sandwiched between the photometric window 16 of the front cover 6 and the light receiving surface 56, and as shown in FIG.
4 and a transparent plastic part such as the protector 14.

In the above embodiment, in order to expose the light receiving surface 56, a substantially circular exposure hole 62c corresponding thereto is exposed.
Is opened in the circuit board 62 (FIG. 8A), but a slit-shaped notch 62e may be formed in the circuit board 62, and the light receiving surface 56 may be exposed from the notch 62e (FIG. 8A). FIG. 8 (B)).

In the above embodiment, the present invention is applied to a light receiving element for an exposure control circuit. However, the present invention is not limited to this. For example, the present invention can be applied to a light receiving element for an auto strobe.

[0033]

As described above, by applying the light receiving element mounting method of the present invention, the light receiving element for measuring the luminance of the object can be securely mounted on the circuit board, and the light receiving surface can be fixed to the object. Since the light can be directed in the direction, it is possible to provide an automatic exposure control device by incorporating a light receiving element into a conventional strobe substrate and making some improvements. Further, the mounting of the light receiving element on the strobe substrate is strengthened, and the shock resistance and vibration resistance are increased, so that a failure can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a film unit with a lens.

FIG. 2 is an external perspective view of a film unit with a lens.

FIG. 3 is an exploded perspective view of the film unit with a lens.

FIG. 4 is an external perspective view of a strobe device to which a light receiving element is attached.

FIG. 5 is a sectional view of a main part of a film unit with a lens different from the embodiment shown in FIG. 1;

FIG. 6 is a cross-sectional view of a main part of a film unit with a lens in which the embodiment shown in FIG. 5 is modified.

FIG. 7 is an exploded perspective view showing a configuration around a light receiving element and a condenser lens shown in FIG. 6;

FIG. 8 is an explanatory diagram showing the vicinity of a light receiving element attached to a circuit board.

[Explanation of symbols]

 Reference Signs List 1 Film unit with lens 2 Exposure unit 3, 61 Strobe device 4 Main body base 4a Cartridge storage room 4b Film storage room 6 Front cover 7 Rear cover 14 Protector 16 Photometry window 17 Power switch 34 Objective lens 44, 62 Circuit board 44a, 62a Pattern Surface 44b, 62b Mounting surface 48 Light receiving element 48b, 48c Connection terminal 49 Strobe light emitting unit 56 Light receiving surface 62c Exposure hole 65 Condensing lens

Claims (3)

[Claims] 1. One surface is a surface on which a circuit element is mounted, and the other surface is a circuit pattern surface on which a wiring pattern used for electrical connection of the circuit element is formed. In a method of attaching a light receiving element for measuring light from an object to a circuit board incorporated in a camera, the connection terminal extending to the back side of the light receiving element is inserted from the circuit pattern surface side to the mounting surface side, and then the connection terminal is bent. And mounting the light receiving element on the circuit pattern surface by inserting its tip from the mounting surface side to the circuit pattern surface side. 2. One surface is a mounting surface of a circuit element, and the other surface is a circuit pattern surface on which a wiring pattern used for electrical connection of the circuit element is formed. A method of attaching a light receiving element for measuring light from a subject to a circuit board incorporated in a camera, comprising: forming an opening through which light from the subject passes through the circuit board; and passing the light receiving surface of the light receiving element to the subject side through the opening. A method of mounting a light receiving element, comprising: exposing and bending a connection terminal extending to the back side of the light receiving element, inserting a tip end of the connection terminal from the mounting surface side to the circuit pattern surface side, and soldering to the circuit pattern surface. . 3. A light receiving surface of a light receiving element protrudes toward a circuit pattern surface through the opening.
The mounting method of the light receiving element described in the above.