JPH0653675A - Holding device for flexible printed board, printed board and flexible printed board - Google Patents

Abstract

PURPOSE:To reduce in thickness a holding device for holding an L-shaped bent part of a flexible printed board to be received by a variable load such as a U-turn flexible board in a thickness direction. CONSTITUTION:A holding tongue piece 1c and a slide guide 1d are formed at an outer periphery of an bent part of a flexible printed board 1 from a first direction 1a to a second direction part 1b through the bent part, the piece 1c is engaged with a slide 2e of a holding part 2, the part 1b is engaged with a slid 2d, and a cover 3 is brought into contact with a slide guide 1d to be coupled to the part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible printed circuit board holding device, a printed circuit board and a flexible printed circuit board.

[0002]

2. Description of the Related Art <First Prior Art> Conventionally, for example, an electric signal from a circuit of a printer main body to a print head provided in a carriage of a printer is sent to the print head without disturbing movement of the carriage. A flexible printed circuit board is used to feed the flexible printed circuit board, and the flexible printed circuit board is bent in a U shape to allow movement of the carriage. Since the end of the flexible cable is subjected to a fluctuating load, a method of fixing the end with a screw or the like has been used so as not to apply an unreasonable load to the flexible printed circuit board.

10 to 13 show a conventional U-turn flexible fixing structure, in which a flexible printed board 7 having a signal line group 7a electrically connects the fixed portion 10 side and the movable portion 8 side. At the same time, as the movable portion 8 moves in the direction of the arrow in FIG. 13, the strip-shaped portion bends and deforms between the fixed portion 10 and the movable portion 8 to form a U-shaped U-turn portion 7b to form the movable portion 8. Allow movement.

On the other hand, the flexible printed circuit board 7 on the movable portion 8 side is formed in a substantially L shape in a plane, and the flexible fixing portion 7c is integrally flexible printed on the L-shaped bent portion on the extension line on the U-turn portion 7b side. A flexible screw 7 is fixed to the movable portion 8 by fixing the flexible fixing portion 7c with a fixing screw 9 formed on the substrate 7.

The movable portion 8 is formed such that the surface of the U-turn guide portion 8a and the surface of the screw stop portion 8b are formed at a right angle, and the tension generated in the flexible printed circuit board 7 which is bent and deformed as the movable portion 8 moves. Can be received at the right angle corner 8c where the guide portion 8a and the screw fixing portion 8b intersect,
The flexible printed board 7 is securely fixed to the movable portion 8.

<Second Prior Art> Conventionally, as a printed board mounted in a lens barrel, Japanese Patent Application No. 1-14013 has been proposed.
As described in No. 6, there has been proposed a donut-shaped printed circuit board that is arranged behind the lens barrel and has an opening for escaping the light flux that has passed through the lens. Further, in order to connect the donut-shaped substrate to another substrate, or an electrical contact, a printed circuit board having a protruding portion extended to the outer peripheral portion of the donut-shaped substrate as described in Japanese Patent Application No. 63-106187. Proposed.

<Third Prior Art> Conventionally, a strip-shaped flexible printed circuit board housed in a cylindrical or polygonal columnar case has a polygonal shape or one of them as described in Japanese Patent Publication No. 63-106190. It is formed so as to be bent into a partial shape.

For example, as shown in FIG. 19, the conical portion 1
In the space 1 formed between the housing 1 and the cylindrical member 2 of the housing 1 having a, a flat flexible printed circuit board 7 bent into a cylindrical shape is provided. In addition,
5 is a mount, 6 is an optical axis, 51 and 52 are electric parts, A '
Is the mounting dimension, and B is the length of the space 4 in the optical axis direction.

[0009]

<Problems to be Solved by the Invention in First Related Art> However, in the above-described first conventional technology, the flexible printed circuit board 7 is used.
Since a screw stop is set as a method for fixing the movable part 8 to the movable part 8, the thickness of the movable part 8 is movable with respect to the occupied size of the U-turn part 7b (the size between the fixed part 10 and the movable part 8). It was necessary to move the part 8 and prevented the device from becoming compact.

<Problems to be Solved by the Invention for the Second Prior Art> However, in the configuration in which the substrate extends outward from the donut shape as in the above-mentioned second prior art, the individual substrate is separated. However, the provision of the protrusion has been a major factor in increasing the cost of the printed circuit board.

On the other hand, due to the increase in the density of electrical parts, there is a demand for a protruding part for connecting between boards and for connecting with an electrical part, or a protruding part as a function of a sub-flex for mounting mounted electrical parts that cannot be mounted. The reality is that it is getting stronger.

<Problems to be Solved by the Invention for the Third Prior Art> However, in the above-mentioned third prior art, the length A ′ of the electric component that can be mounted is different from the length B of the space portion 4. It was short, and it could not be said that the space portion 4 was necessarily used effectively.

[0013]

The specific constitution for achieving the object of the present invention is as set forth in the claims.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIGS. 1 to 5 show a first embodiment of a flexible printed circuit board holding device according to the present invention.

Reference numeral 1 denotes a flexible printed circuit board having a portion formed in a plane L-shape, and the signal line group 1e is also bent at the L-shaped bent portion. The side on which the letter-shaped portion is formed (indicated by → D) is the first direction portion 1a, and the side of the other portion of the L-shaped portion (indicated by → E) which is orthogonal to the first direction portion 1a is the second direction portion 1a. Direction portion 1b, the first direction D is formed on the outer peripheral portion of the L-shaped portion.
The slide guide portion 1d is integrally formed so as to project in the opposite direction, and the holding tongue piece 1c is integrally formed so as to project in the opposite direction to the second direction E.

Reference numeral 2 denotes a bridge-shaped holding portion which is the first member of the holding device, and guide portions 2b and 2c which face each other are provided on both sides of the flat portion 2a which forms the bridge portion, and slits 2d and 2e are provided.
To extend vertically. That is, as shown in FIG. 4, the flat surface portion 2a holds the flexible printed circuit board 1 in parallel during assembly, and the slit 2d is fitted with the first direction portion 1b, which is the side that receives the variable load of the flexible printed circuit board 1. The holding tongue 1c of the flexible printed circuit board 1 is fitted into the slits 2e to prevent the flexible printed circuit board 1 from rising.

Here, the slits 2d and 2e have a slit width (y1 = x1 + Δx) having a predetermined minute interval (Δx1) with respect to the thickness (x1) of the flexible printed board 1.
It is formed in 1).

In the present embodiment, the slit width (y1) is set to the same value for both the slits 2d and 2e, but the slit widths (y1) can be set to different values within the allowable range of the minute interval (Δx1). A first abutting portion 2f is formed at one end of the slit 2d in a direction orthogonal to the slit direction.
A second abutting portion 2g is formed in e similarly to the first abutting portion 2f.

The depth of the slit 2d is z as shown in FIG.
It is set to 1, and this value (z1) is set to have a fitting relationship with the width of the flexible printed circuit board 1. Similarly, the depth of the slit 2e is also the flexible printed circuit board 1.
It is set according to the dimensions of.

Reference numeral 3 denotes a cover portion which, after assembly, comes into close contact with the tip of the holding portion 2 (bonded by an adhesive, for example) as shown in FIG. 1, whereby the two slits 2d and 2e have a square hole shape. Further, the slide guide portion 1d of the flexible printed board 1 contacts the cover portion 3 to determine the position of the flexible printed board 1.

The flexible printed circuit board 1 held by the holding device having such a structure receives a fluctuating load when the holding device moves in the direction of arrow D and in the opposite direction. By the forces N1 to N3,
You will receive the following holding power.

(+) D = N1 + N2 or (-) D = N3 Here, (+) D: load in the D direction (-) D: load in the opposite direction to the D direction N1: first abutment Reaction force generated in the portion 2f N2: Reaction force generated in the second abutting portion 2g N3: Reaction force generated in the cover portion 3 As a result, the force in both the D direction and the direction opposite to the D direction is reliably retained, No abnormal moment is generated in the flexible printed circuit board 1.

Further, the flexible printed circuit board 1 is securely held so that even when a load is applied in the E direction or the direction opposite to the E direction, the flexible printed circuit board 1 can be easily guided by balancing the moments at the points.

Further, the flexible printed circuit board 1 is held at a predetermined interval Δx1 with respect to the slits 2d and 2e, so that the flexible printed circuit board 1 is securely held even when a load is applied in the G direction in FIG.

Also, the force in the rotational direction on the flexible printed circuit board 1 is surely held between the two slits 2d and 2e by the balance of the moment between the cover portions 3.

According to this embodiment, it is not necessary to provide a screw fixing portion for screw fixing as in the conventional case, so that the flexible printed circuit board 1 can be securely held in an extremely thin space.

Further, with respect to the signal line bent in the L-shape, the protruding amount of the L-shape in the outer direction is only the tongue piece, which is excellent in space efficiency.

<Second Embodiment> FIGS. 6 to 9 show a second embodiment.

This embodiment shows an example in which the holding force of the flexible printed circuit board is changed from the three-point support shown in the first embodiment to four-point support, and a temporary holding structure is provided at the time of assembly. There is.

Reference numeral 63 denotes a cover portion, which holds and holds the second direction portion 1b of the flexible printed circuit board 1 between the first pressing portion 63a and the first abutting portion 2f provided on the cover portion 63. The holding tongue 1c is attached to the second pressing portion 63b.
It is sandwiched and held by the second butting portion 2g. This results in a four-point support format.

A holding pin 2g is projected on the flat surface portion 2a of the holding portion 2, and an engaging hole 1f is provided at a corresponding position on the flexible printed board 1, and the holding pin 2j is provided in the engaging hole 1f. By entering, the temporary engagement at the time of assembly can be performed.

The holding device of the present embodiment having the above-mentioned structure has the same effect as that of the first embodiment described above, and the position of the flexible printed circuit board can be maintained even when the cover portion 3 is not attached during the assembly. Therefore, it is possible to prevent an assembly failure such that the flexible printed circuit board is sandwiched between the cover portion 3 and the holding portion 2 during assembly.

<Third Embodiment> FIGS. 14 and 15 show a third embodiment.
An example of is shown. The reference numerals of the members used in FIGS. 14 and 15 are the same as those used in the above-described embodiment, but the members are different.

Reference numerals 1, 2, and 3 denote lenses, 4 denotes a lens barrel for holding the lenses 1 to 3 and the mechanical diaphragm 8, and they are helicoidally coupled to the fixed barrel 5. 6 is an operating ring rotatably coupled to the fixed barrel 5, and 7 is integrally fixed to the lens barrel 4, and
It is a roller connected to the operation ring. Reference numeral 8 is a mechanical diaphragm unit held by the lens barrel 1, 9 is a diaphragm driving unit for driving the mechanical diaphragm unit 8, and is electrically connected to the main substrate 10 via a relay flexure 11 and a connector 12. The main board 10 is fixed to the fixed barrel 5 and carries electrical parts for controlling the position of the lens, and the projection 10a and the camera on which the connector 12 for electrically connecting the diaphragm drive unit 9 is mounted. It has a protrusion 10b which is electrically connected to an electric contact 14 which is electrically connected to a body (not shown). Reference numeral 11 is a relay flexible printed circuit board that electrically connects the diaphragm drive unit 9 and the main board 10, and 12 is a protruding portion 10 of the main board.
A connector mounted on a, 13 is a mount for mechanically connecting to a camera body (not shown), and 14 is an electrical contact electrically connected to the camera body side, which is electrically connected to the protruding portion 10b of the main board 10. Connected.

As shown in the development view of FIG. 15, the main board 10 has the projections 10a and 10b extended to the inner diameter side of the donut shape.

In this embodiment, the projecting portions are extended to connect to another substrate and to connect to the electrical contacts, but the electrical components cannot be mounted only by the donut-shaped portion, for example. It is also possible to provide a projecting portion for absorbing and to extend to the inner diameter side of the opening.

As described above, the member of the inner portion of the donut-shaped portion, which is conventionally unnecessary, can be effectively used.

<Fourth Embodiment> FIGS. 16 to 18 show a fourth embodiment. Note that the reference numerals of the members used in FIGS. 16 to 18 are the same as the reference numerals used in the above-mentioned respective embodiments, but the members are different.

Flexible printed circuit board 3 of this embodiment
18 has a trapezoidal portion having an inner periphery smaller than the outer periphery as one surface, and has six surfaces connected to each other to form a bent portion 21, and both ends are joined to each other, as in the developed shape shown in FIG. As shown in FIG. 17, it is formed in a hollow hexahedron with one end being recessed, and electric components 31, 32, 33, 34 are attached to the inner surface side and the outer surface side thereof. A holding portion 3a extends on the end surface on the large diameter side.

As shown in FIG. 16, the flexible printed circuit board 3 thus constructed is housed in the space 4 at the rear part of the lens barrel, and is fixed by screwing the holding part 3a to the inner cylinder 2. Has been done. This lens barrel is the same as the lens barrel of FIG. 19 shown in the conventional example, and the outer periphery of the space portion 4 is formed in a conical shape. When the trapezoidal inclination angle shown in FIG. 18 is θ2 and the apex angle of the conical portion 1a of the outer cylinder 1 inclined with respect to the optical axis is θ1 as shown in FIG. 16, θ1 = 2θ2 By setting, the flexible printed circuit board 3 can be housed in the space portion 4 along the conical portion 1a of the outer cylinder 1.

Therefore, in the conventional case shown in FIG. 19, the mounting dimension A ′ is smaller than the length B of the space 4 in the optical axis direction.
While only the electric component of No. 1 can be mounted, the electric component of the mounting dimension A longer than the dimension B can be mounted in this embodiment.

<Fifth Embodiment> FIGS. 20 to 22 show a fifth embodiment.

As shown in FIG. 20, this embodiment is an example of a flexible printed circuit board which is effective when the space 14 formed at the rear of the lens barrel has a small inner diameter at the front and a small inner diameter at the rear. 20 shows an outer cylinder 11
a is a mount opening (conical portion), 12 is an inner cylinder, 13
Is a flexible printed circuit board, 14 is an outer cylinder 11 and an inner cylinder 1.
Spaces 41 to 44 formed by 2 and 2 are electric parts.

Flexible printed circuit board 13 of this embodiment
As shown in the developed view of FIG. 22, the planar shape of the rectangular shaped flat surface portion 13b is defined as one surface, and the six rectangular surfaces are connected to form the first bent portion 23. The second bent portion 22 is provided at one end of the flat surface portion 13b.
21, the trapezoidal hanging portions 13a are connected to each other. As shown in FIG. 21, both ends of the rectangular flat surface portion 13b are joined to form a hollow hexagonal columnar outer cylinder portion.
3a is bent inside the outer tubular portion, and each of the hanging portions 13a forms an inner tubular portion having a small diameter in the front.
a on the outer surface side of a and on the outer peripheral side of the rectangular flat surface portion 13b.
~ 44 can be attached.

Further, the insertion piece 13c protruding from the rectangular flat surface portion 13b is engaged with the groove portion of the inner cylinder 12 for positioning and fixing.

With such a structure, the same effect as in the above-described fourth embodiment can be obtained in that the inclination formed in the space can be effectively utilized, and in addition, the electric parts can be mounted in multiple layers. Thus, high density mounting of electric parts can be achieved.

[0047]

(A) The flexible printed circuit board according to the present invention has the following effects.

The flexible printed circuit board holding device can be made thinner in the thickness direction of the flexible printed circuit board, and the device can be made compact.

Since the flexible printed circuit board can be securely held in both the first direction and the second direction, undue stress is not generated on the flexible printed circuit board.

Since the amount of protrusion of the L-shape for holding the L-shaped flexible printed board in the outward direction can be made extremely small, the apparatus can be made compact.

Since the conventional screw fixing is unnecessary,
Easy to assemble and excellent reliability is obtained.

(B) According to the printed circuit board of the present invention, in the doughnut-shaped printed circuit board, the projecting portion is extended to the inner diameter side, so that the projecting portion can be provided without increasing the cost of the substrate. Therefore, without worrying about the cost increase of the printed circuit board, the projecting part for connecting to other printed circuit boards and electrical parts, or the projecting part as a sub-flexible part that absorbs the mounted electrical parts that cannot be mounted only by the donut part. It became possible to provide a printed circuit board compatible with higher density of electrical parts.

(C) According to the flexible printed circuit board of the present invention, since the strip-shaped flexible printed circuit board is bent and formed so as to have a plurality of planes inclined with respect to the optical axis, a plane parallel to the optical axis is formed. It becomes possible to take a mounting space wider than that of the flexible printed board in the shape of a strip that is bent to have.

Further, by changing the inclination angle, the shape can be made to match the shape of the housing to be stored, and the limited storage space can be effectively utilized, which has an excellent effect of greatly contributing to downsizing of the device. Play.

[Brief description of drawings]

FIG. 1 is a perspective view of a flexible printed circuit board holding device according to a first embodiment.

FIG. 2 is an exploded perspective view of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

5 is a view on arrow C of FIG.

FIG. 6 is a perspective view of a flexible printed circuit board holding device according to a second embodiment.

FIG. 7 is a view on arrow H of FIG.

8 is a cross-sectional view taken along the line I-I of FIG.

FIG. 9 is a view on arrow J of FIG.

FIG. 10 is a perspective view of a conventional flexible printed circuit board holding device.

FIG. 11 is a view on arrow K of FIG.

12 is a sectional view taken along line LL in FIG.

13 is a view on arrow M of FIG.

FIG. 14 is a sectional view of a lens barrel showing a third embodiment.

15 is a plan view of the printed circuit board shown in FIG.

FIG. 16 is a partial sectional view of a lens barrel showing a fourth embodiment.

FIG. 17 is a perspective view of the flexible printed board of FIG.

FIG. 18 is a development view of the flexible printed board of FIG.

FIG. 19 is a partial cross-sectional view in which a conventional strip-shaped flexible printed circuit board is applied to a lens barrel having a conical portion.

FIG. 20 is a sectional view of a lens barrel showing a fifth embodiment.

FIG. 21 is a perspective view of the flexible printed board shown in FIG. 20.

FIG. 22 is a development view of the flexible printed board shown in FIG. 21.

[Explanation of symbols]

 In FIGS. 1 to 13, 1 flexible printed circuit board 1a first direction part 1b second direction part 1c holding contact piece 1d slide guide part 1e signal line 1f engaging hole 2 holding part 2a flat part 2b, 2c guide part 2d, 2e Slits 2f, 2g Abutting part 2j Holding pin 3 Cover part In FIGS. 14 and 15, 1,2,3 Lens 4 Lens barrel 5 Fixed barrel 6 Operating ring 8 Mechanical aperture 10 Main board 10a10b Projection 11 Relay flex 12 Connector 13 Mount 14 Electrical Contact In FIGS. 16 to 22, 1, 11 Housing 2, 12 Cylindrical member 3, 13 Flexible printed circuit board 4, 14 Space portion 31 to 34, 41 to 44, 51, 52 Electrical component

Claims (7)

[Claims] 1. A first printed circuit board portion on one side of an outer circumference of the flexible printed circuit board, wherein the first printed circuit board portion is connected to a second printed circuit board portion through a bent portion that bends in an L shape together with a signal line. Holding tongues are formed along the outer side of the holding tongue, and slits are formed to face the bridge, respectively, which are fitted into the holding tongues and the second base plate portion facing the holding tongues. A holding member; and a holding member that is pressed against the first substrate portion and is joined to the holding member in a state where the holding tongue piece and the second substrate portion are fitted in each slit of the holding member. A device for holding a flexible printed circuit board, which is characterized in that: 2. The flexible printed circuit board according to claim 1, wherein a protruding portion that abuts against the pressing member is formed on a side of the bent portion opposite to the first substrate portion, and the protruding portion that abuts the slit of the holding member. 2. A holding device for a flexible printed circuit board, characterized in that an abutting portion for contacting the second substrate portion and the holding tongue piece and restricting the movement of the flexible printed circuit board is formed. 3. The flexible printed circuit board according to claim 1, wherein an engaging hole is formed in the bent portion of the flexible printed circuit board.
A holding device for a flexible printed circuit board, wherein an engaging protrusion that engages with the engaging hole is formed in the bridge portion of the holding member. 4. A printed circuit board, which is disposed in the lens barrel substantially perpendicular to the optical axis and has an opening for escaping a necessary light flux passing through the lens, wherein the printed circuit board extends through a flexible region. A printed circuit board, characterized in that the protruding portion that extends out extends toward the inner diameter side of the opening portion when expanded. 5. A tubular flexible printed circuit housed along a cone-shaped portion or a polygonal pyramid-shaped portion in a housing having a cone-shaped portion or a polygonal pyramid-shaped portion, the strip-shaped flexible printed circuit board comprising: A flexible printed circuit board is formed so as to have a plurality of planes inclined with respect to an optical axis. 6. The flexible print according to claim 5, wherein the plurality of inclined planes are main mounting surfaces, and on which electric components longer than a length along the optical axis direction in the housing are mounted. substrate. 7. The flexible printed board according to claim 5 or 6, wherein a holding portion for positioning and maintaining parallelism with respect to a conical portion or a polygonal pyramid portion in the housing is provided on a part of a side of the flexible printed circuit board. A flexible printed circuit board having.