JPH10209599A - Circuit board, its manufacturing method and film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the manufacturing work of a circuit substrate. SOLUTION: The strobo board 32, which is built-in in a film unit with a lens, is integrally formed by casting with a conductive pattern sheet and an insulator 53. The conductive pattern sheet is formed in such a manner that a plurality of circuit patterns are continuously connected by a plurality of coupling parts. Besides, a synchronous armature 35 and armature 47 and 48, to be used for a power source battery 34, are integrally formed in the state wherein they are developed to the conductive pattern sheet, and they are bent after insert-molding and put in the prescribed attitude.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit board in which a plurality of conductive patterns constituting an electronic circuit are mounted on an electronic component by mounting the electronic parts so as not to be separated on a plane, a method of manufacturing the same, and a method of using the same. The present invention relates to a film unit with a lens.

[0002]

2. Description of the Related Art An inexpensive single-sided printed wiring board is manufactured by a screen printing method using an etching resist ink using a paper phenol copper-clad laminate. In this method, a copper clad laminate is produced through steps such as leveling, screen printing, etching, resist removal, leveling, and solder resist printing.

[0003]

However, although the above-described steps are automated, the number of steps is large and the production cost is still high. Moreover, defects that cannot be found by electrical inspection, such as residual copper, chipping, pinching, protrusions, pinholes, and the like, are likely to occur, and appearance inspection becomes indispensable, which is a factor that increases manufacturing costs.

An object of the present invention is to solve the above-mentioned problems and to provide a circuit board having a low manufacturing cost, a manufacturing method thereof, and a film unit with a lens using the same.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a method for forming a plurality of circuit patterns formed by punching a conductive sheet and an insulator formed by casting these circuit patterns into a single body. Also constituted the circuit board. As a manufacturing method of integrating a plurality of circuit patterns by casting with an insulator, insert molding is preferable. At the time of this insert molding, an opening for exposing a through hole for inserting an electronic component to be mounted later to the outside is formed. The insert component set in the mold has a plurality of circuit patterns. If the insert is automated, the molding cycle can be improved. Furthermore, if a plurality of insert molds are prepared and the insert mold is infinitely circulated with respect to the counterpart mold and molded,
Molding work can be performed in parallel with insert work,
The cycle time can be further reduced.

According to the second aspect of the present invention, a conductor pattern sheet punched out of one conductor sheet in a state where a plurality of circuit patterns are connected in series via a connection portion, and the conductor pattern sheet is formed by casting. It is composed of an integrated insulator, and the plurality of circuit patterns are electrically separated from each other by an opening punched through a region including a connecting portion of the conductor pattern sheet after being cast with the insulator. Is what it is.

The conductor pattern sheet is formed by punching a plurality of circuit patterns in a pattern shape connected in series at a plurality of connecting portions so as not to be separated on a plane. After that, the semiconductor device is separated into a plurality of circuit patterns by punching through a region including the connection portion. According to this, since a single conductor pattern sheet in which a plurality of circuit patterns are connected by a connecting portion is used as an insert part, handling is simpler than in the case of inserting a plurality of circuit patterns, and Work time can be reduced.

When one conductor pattern sheet is inserted, it is necessary to separate the conductor pattern sheet into a plurality of circuit patterns after insert molding.
Therefore, in the last operation, the connecting portion of the conductor pattern sheet is punched. The punching may be performed by piercing and punching together with the insulator, or at the time of insert molding, an opening for exposing a region including the connecting portion to the outside is formed in the insulator, and only the connecting portion is aligned with the opening. You may make it penetrate and pierce.

The lens-equipped film unit with a strobe has a built-in strobe unit. The strobe unit is roughly composed of a strobe circuit board, a mounting component (electronic component) attached thereto, a synchro contact, a battery contact piece, a strobe light emitting section, and the like. The strobe circuit board can be formed by the method described above. In the case of molding in which a plurality of circuit patterns are inserted in a separated form, synchro contacts and battery contact pieces connected to the circuit patterns may be inserted together.

In the case of molding in which a single conductor pattern sheet is inserted, a conductor sheet is provided in a form in which a plurality of circuit patterns are connected by a connecting portion and synchro contacts and battery contact pieces are provided in an expanded form. May be punched out to form a conductor pattern sheet, and then bend after insert molding to form a predetermined posture. Further, the insulator may have an action of holding other components in addition to the action of integrating the conductor pattern sheet and the plurality of circuit patterns.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, a film unit with a lens (hereinafter referred to as "film unit") 9 is a unit main body 10 containing a photographic film cartridge, various photographing mechanisms, and a strobe unit. When,
And an exterior body 11 that covers part or all of this.

The unit body 10 is, as shown in FIG.
It comprises a front cover 13, a main body base 14, an exposure unit 15, a strobe unit 16, a photographic film cartridge 17, and a rear cover 18. The cartridge base 2 is provided on one side of the main body base 14 with the aperture 19 interposed therebetween.
A cartridge storage chamber 21 for storing a film roll 22a for drawing out the photo film 22 from the cartridge 20 in a roll form is provided integrally with the other side.

The rear cover 18 includes a cartridge storage chamber 2.
Pull-top type bottom lids 24 and 25 for closing the bottoms of the film roll chamber 1 and the film roll chamber 23 are provided respectively. After the rear cover 18 is attached, the bottom of each of the chambers 21 and 23 is closed by the bottom lids 24 and 25, so that the photographic film cartridge 17 is light-tightly stored between the main body base 14 and the rear cover 18. Bottom lid 2 for closing the bottom of the cartridge storage chamber 21
Reference numeral 4 denotes a lid which is opened when the cartridge 20 containing the photographic film 22 which has been photographed in the developing station is taken out.

A winding knob 26 is rotatably provided above the cartridge storage chamber 21. A part of the winding knob 26 is exposed from an opening 27 of the rear cover 18. When the film winding operation is performed, the unexposed photographic film 22 is pulled out from the film roll chamber 23 and set in the aperture 19, and at the same time, the exposed photographic film 22 is stored in the cartridge 20.

The shutter button 28 is provided on the upper surface of the front cover 13 so as to be resiliently provided with a part thereof cut out, and the shutter mechanism of the exposure unit 15 is operated by a pressing operation. The shutter mechanism is of a type in which a shutter blade swings in front of a shutter opening. When the shutter blade swings, the subject light passes through the photographing window 29 of the front cover 13 and the photographing lens 30 of the exposure unit 15 and enters the photographic film 22 set on the aperture 19 through the shutter opening. . A space between the shutter opening and the aperture 19 is defined as a dark room by a dark box 31 provided in the exposure unit 15.

The strobe unit 16 includes a main capacitor 3 mounted on a circuit board 32 including a power supply circuit and a trigger circuit.
3 is a unit component in which a mounting component such as 3, a power supply battery 34, a synchro contact 35, and a strobe light emitting section 36 are integrally attached. The strobe unit 16 is attached to a correct position of the main body base 14 by a positioning means, and is held by a pawl connection. The positioning means includes the main body base 14.
And positioning holes provided in the circuit board 32. The claw connection includes an elastic locking claw 37 provided on the main body base portion 14 and an engaged portion provided on the circuit board 32.

On the front surface of the front cover 13, there is provided a strobe charging switch 38 which is cut out and formed elastically. Behind the flash charging switch 38, a short-circuit plate 39 formed by bending a conductive material elastically is provided. The short-circuit plate 39 contacts a pair of contacts provided on the circuit board 32 by pressing the strobe charging switch 38 to close the power supply circuit.

As shown in FIG. 4, a switch 40 comprising a short-circuit plate 39 and a pair of contacts is connected in series to a power supply circuit 41. The high voltage output from the power supply circuit 41 charges the trigger capacitor 42 and the main capacitor 33. The trigger transformer 42 includes a trigger transformer 4.
The primary winding 43a is connected to the contact piece 35a on one side of the sync contact 35, and the secondary winding 43b is started to discharge the discharge tube 44 provided inside the strobe light emitting unit 36. Trigger electrodes 45 are connected to each other.

When the shutter is released, the exposure unit 1
The shutter blade provided in 5 swings once. When the shutter blades are fully opened during this time, one contact piece 35a of the sync contact 35 comes into contact with the other contact piece 35b. At this moment,
The trigger circuit is short-circuited, and the electric charge stored in the trigger capacitor 42 is discharged via the primary winding 43a.
When the trigger circuit is short-circuited in this way, a trigger signal for light emission is given to the discharge tube 44 via the secondary winding 43b and the trigger electrode 45, and the discharge tube 44 is discharged by the electric charge stored in the main capacitor 33. , To provide auxiliary lighting to the subject.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply battery 34 is held in a strobe unit 16. As shown in FIG. 1, the power supply battery 34 has a form in which a coating is removed from a commercially available AA battery. In this embodiment, the electrode from the button side surface 34a of the cylinder to the outer periphery is also a positive electrode, and the outer periphery has a recess 34c which is recessed one step closer to the minus electrode 34b.
Is provided. The circuit board 32 is integrally provided with a C-shaped battery contact piece 47 that holds the power supply battery 34 by being inserted into the recess 34c from above. Further, when the power supply battery 34 is held by the battery contact piece 47, a battery contact piece 48 connected to the negative electrode 34 b of the power supply battery 34 is also provided integrally with the circuit board 32. Note that reference numeral 4
Reference numerals 9 and 50 denote a pair of contacts forming the switch 40 together with the short-circuit plate 39.

The circuit board 32 is formed by insert molding in which a conductor pattern sheet is cast into an insulator and integrated. As shown in FIG.
Reference numeral 2 denotes a plurality of circuit patterns, through holes formed in each circuit pattern, synchro contacts 35 connected to the circuit patterns, battery contact pieces 47 and 48, a pair of contacts 49 and 50,
It comprises discharge tube connecting pieces 56 and 57 and a connecting portion 58.

The conductive pattern sheet 52 is formed by punching one conductive sheet into a predetermined pattern in a punching step. The punched shape is a shape in which a plurality of circuit patterns are connected in series at the connecting portion 58, and the synchro contact 35, the battery contact pieces 47 and 48, the pair of contacts 49 and 50,
In addition, the contour is obtained by adding the expanded shape of the discharge tube contact pieces 56 and 57. At the time of punching, through holes predetermined on each circuit pattern are also punched together.
By doing so, the sheet can be handled as one sheet, so that subsequent operations are simplified. In this example, the conductor sheet is a thin metal material having a thickness of, for example, 0.3 mm.

The punched conductor pattern sheet 52 is integrated with an insulator 53 which is an insulating plastic material. As this manufacturing method, insert molding is desirable. As shown in FIG. 6, the insulator 53 is inserted into the sync contact 35 and the battery contact piece 4 by insert molding.
7, 48 are formed in a contour shape exposing to the outside. During this molding, the discharge tube contact piece 56 and the pair of contact points 49,5
An opening for exposing 0, an opening for exposing a region including the through hole, an opening for exposing a region including the connecting portion 58, and the like are also formed together. further,
A positioning hole that engages with a positioning pin provided on the main body base portion 14 and an engaged portion with which a locking claw 37 provided on the main body base portion 14 engages are molded together.

Further, in this example, in order to reduce the number of components to be attached to the circuit board 32, the support portion 55 constituting the strobe light emitting portion is molded together with the insulator 53 at the time of insert molding. The support portion 55 is provided with the discharge tube contact piece 5.
7 is formed. Therefore, the discharge tube contact piece 57 is bent after punching the conductor sheet. In this example, the bent portions 47a, 47b, 48a, 48b and the like provided on the battery contact pieces 47, 48 are simultaneously bent in this punching step. Note that these bent portions 47a, 47b, 48a, 48b may be formed in a later bending step. Further, if an opening or a depression is provided in the conductor pattern sheet 52 to be inserted, and a plastic material is cut into these at the time of insert molding, the conductor pattern sheet 52 is firmly fixed to the insulator 53. You.

After the insert molding, a region including the connecting portion 58 exposed from the opening of the insulator 53 is punched, and the individual circuit patterns are electrically separated. The punching of the connecting portion 58 is performed toward the arrow line shown in FIG. In addition,
These arrow lines are shown only on the connecting portion 58 of the main part.

After the punching of the connecting portion 58, as shown in FIG. 8, the synchro contact 35, the battery contact pieces 47 and 48, the discharge tube contact piece 56 and the like are bent and formed into a predetermined posture.
Thus, the circuit board 52 is completed. Thereafter, mounted components such as the main capacitor 33, the trigger capacitor 42, and the trigger transformer 43 shown in FIG. 9 are inserted into the through holes and mounted on the circuit board 52 by soldering. After that, the discharge tube 44 is attached to the support portion 55, and the discharge tube contacts 56, 57 are soldered to both ends of the discharge tube 44, and then the reflector 59 and the diffusion plate 60 are attached to the support portion 55, whereby the strobe unit 16 is mounted. Is completed. The strobe unit 16 is supplied to a film unit assembling process, where it is incorporated into the unit body 10.

Next, the operation of the above configuration will be briefly described. The manufacture of the circuit board 32 includes a conductor punching step, an insert molding step, a connecting part punching step, a bending step, and the like.

In the conductor punching step, a conductor pattern sheet 52 is formed by punching one conductor sheet into a predetermined pattern shape. At this time, a through hole is also punched at the same time. The punched shape is a shape in which a plurality of circuit patterns are connected by a connecting portion 58, and the synchro contact 35, the power battery contacts 47 and 48, and the discharge tube contact 5.
6, 57 are formed by connecting the developed shapes.

In the insert molding step, the conductor pattern sheet 52 is cast and integrated. At this time, an opening for exposing the region including the through hole, an opening for exposing the region including the connecting portion 58, an opening for exposing the pair of contacts 49 and 50, a positioning opening for attaching to the main body base 14, and The joint portion, the support portion 55 and the like are also molded at the same time. As the mold, a divided mold is used, and the conductor pattern sheet 52 is inserted into one of the molds. Then, after the molds are combined, an insulating plastic material is injected to form the insulator 53.

In the form after molding, only the contact pieces 35a, 35b, 47, 48, 56, etc., which are bent in the next step, are exposed from the outer contour of the insulator 53, and the remaining portion is the insulator 53
Covered with.

In the bending step, the developed portions such as the contacts 35a, 35b, the contact pieces 47, 48, 56 are bent and formed, and the synchro contact 35 and the battery contact pieces 47, 4 are formed as shown in FIG.
8, and the discharge tube contact piece 56 are formed in a predetermined posture.

In the connecting portion punching step, a region including the connecting portion 58 is punched through. Thereby, the plurality of circuit patterns are electrically separated from each other. At this time, the connecting portion 58 may be punched together with the insulator 53. In this case, the formation of the opening that exposes the region including the connecting portion 58 at the time of insert molding can be omitted.

As shown in FIG. 9, the completed circuit board 32 has a main capacitor 33 and a transformer 4 for triggering.
3. The electronic components and the like constituting the trigger capacitor 42 and the power supply circuit 41 are inserted and mounted by soldering. After the mounting, the discharge tube 44 is attached to the support portion 55 together with the reflector 59, and both terminals of the discharge tube 44 are connected to the contact pieces 56,
After soldering to 57, the diffusion plate 60 is attached to complete the strobe light emitting section 36. Although not shown, a trigger electrode 45 is arranged on the back of the reflector.

The strobe unit 16 assembled in this manner is supplied to the assembling process of the film unit 9, where it is incorporated in the unit main body 10 together with the power supply battery 34.

In the above embodiment, the circuit board 32 is used for the strobe unit 16 of the film unit 9. However, the present invention is not limited to this, and it goes without saying that the circuit board 32 can be used for any board or wiring board. Absent.
In addition, the sync contact 35,
Although the power supply batteries 47 and 48 and the discharge tube connecting pieces 56 and 57 are provided integrally, in the present invention, only one of these may be provided. Further, the synchro contact 35, the power batteries 47 and 48, and the discharge tube contacts 56 and 5
7 may be an insert part.

Further, in the above embodiment, one conductor pattern sheet in which a plurality of circuit patterns are connected by a connecting portion is inserted. However, the present invention is not limited to this, and a plurality of circuit patterns may be inserted. You may.

[0037]

As described above, in the present invention, the circuit board has a structure in which a plurality of circuit patterns formed by punching a conductive sheet are integrated with an insulator to be cast.
The work is simpler than in the prior art, and the cost can be reduced. Further, in another invention using a conductor pattern sheet connected in series at a connecting portion so that a plurality of circuit patterns are not separated on a plane, handling by insert molding becomes easy, and the insert time can be reduced. In order to separate the conductor pattern sheet into a plurality of circuit patterns, it is only necessary to punch out the connecting portion after the formation, and this can be performed at low cost. Also, since the circuit pattern is formed by punching the conductor sheet, the remaining copper, chipping, pinching, protrusion,
Also, defects such as pinholes do not occur.

Further, any one of the expanded synchro contact, the power battery contact piece, and the discharge tube contact piece is formed integrally with the conductor pattern sheet, and is formed by bending into a predetermined posture after insert molding. In this case, the time required for the insert operation can be reduced as compared with the case where any one of the synchro contact, the power battery contact piece, and the discharge tube contact piece is inserted and integrated with an insulator. Further, in the invention in which the supporting portion is formed simultaneously with the insulator, the mounting operation time can be reduced as compared with mounting another component after the molding.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a strobe unit using a circuit board of the present invention.

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

FIG. 3 is an exploded perspective view of a unit main body.

FIG. 4 is a circuit diagram schematically showing an electrical configuration of a strobe unit.

FIG. 5 is a perspective view showing a conductor pattern sheet formed by punching a conductor sheet.

FIG. 6 is a perspective view showing a state after insert molding.

FIG. 7 is a perspective view showing a state where a connecting portion is punched out.

FIG. 8 is a perspective view showing a state where a contact piece or the like is bent and formed.

FIG. 9 is a perspective view schematically showing an electronic component mounted on a circuit board.

[Explanation of symbols]

 Reference Signs List 9 Film unit with lens 10 Unit main body 16 Strobe unit 32 Circuit board 35 Synchro contact 49, 50 A pair of contacts for starting charging 52 Conductor pattern sheet 53 Insulator 55 Support 56, 57 Discharge tube contact 58 Connection

Claims (9)

[Claims] 1. A circuit board comprising: a plurality of circuit patterns formed by punching a conductive sheet; and an insulator formed by casting and integrating the plurality of circuit patterns. 2. A method according to claim 1, further comprising a step of punching a conductor sheet to form a plurality of circuit patterns by punching the plurality of circuit patterns, and an insert molding step of casting the plurality of circuit patterns into a single piece by insulating plastic material. Manufacturing method of a circuit board. 3. A conductor pattern sheet punched from one conductor sheet in a state where a plurality of circuit patterns are connected in series through a connection portion, and an insulator formed by casting and integrating the conductor pattern sheet. And wherein the plurality of circuit patterns are electrically separated from each other by openings punched through a region including the connection portion of the conductor pattern sheet after being cast with the insulator. Circuit board. 4. A conductor sheet punching step of punching a conductor sheet and forming a conductor pattern sheet connected by a connecting portion so that a plurality of circuit patterns are not separated on a plane, and said conductor pattern sheet is made of an insulating plastic material. An insert molding step of casting and integrating, and a connecting portion for electrically separating the plurality of circuit patterns from each other by punching out through a region including the connecting portion of the conductive pattern sheet after being cast with the plastic material. A method for manufacturing a circuit board, comprising a punching step. 5. A film unit with a lens having a built-in strobe circuit board, wherein the strobe circuit board has a plurality of circuit patterns formed by punching a conductive sheet, and an insulation formed by casting the plurality of circuit patterns into one piece. A film unit with a lens, characterized by comprising a body. 6. A film unit with a lens having a built-in strobe circuit board, wherein the strobe circuit board is a conductor punched out of one conductive sheet in a state where a plurality of circuit patterns are connected in series via a connecting portion. A pattern sheet, and an insulator integrally formed by casting the conductor pattern sheet. The plurality of circuits are formed by punching through a region including the connection portion after casting the insulator. A film unit with a lens, wherein a strobe circuit is formed by electrically separating patterns from each other. 7. A strobe circuit board, a synchro contact, a discharge tube contact, a power battery contact, and the like are attached and integrated, and at least the synchro contact, the discharge tube contact, and a power supply are provided. 6. The lens-fitted film unit according to claim 5, wherein any one of the battery contact pieces is cast together with the plurality of circuit patterns and integrated with the insulator. 8. The flash circuit board is provided with a synchro contact, a discharge tube contact, a power battery contact, and the like, which are integrated with each other. At least the synchro contact, the discharge tube contact, and a power supply Any one of the battery contact pieces is integrally formed in a developed form on the conductor pattern sheet so as to be exposed from the insulator, and after the conductor pattern sheet is cast with the insulator, a predetermined shape is formed. 7. The lens-fitted film unit according to claim 6, wherein the film unit is bent in a posture. 9. A lens with a lens according to claim 5, wherein a support portion for supporting a discharge tube connected to the discharge tube contact piece is formed integrally with the insulator. Film unit.