JPH01251777A - Method of supporting hard printed-circuit board - Google Patents

Abstract

PURPOSE:To make a soldering operation easy and to enhance the reliability by a method wherein a contact part of a hard printed-circuit board with a support member is set near a part on a perpendicular bisector of a line connecting one side to the other side facing the side of the circuit board. CONSTITUTION:A hard printed-circuit board 30 is pierced by a protruding part 1c of a fixed cylinder 1; it is supported to be movable like a seesaw near a part on a perpendicular bisector of a line connecting an end 30a of one side near a soldered part 31a to an end 30b of the other side away from the soldered part 31a in such a way that a collision part 1b of the fixed cylinder 1 is used as a fulcrum. A contact block 31 is used to transfer an electrical signal to a camera body; it is connected electrically to the hard printed-circuit board 30 through the soldered part 31a. When a soldering operation is executed, a part near said end 30b is pressed by means of an appropriate force; then, the soldered part 31 is pressed with a soldering iron; it is eliminated that the soldered part 31a is detached and floats from the printed-circuit board 30.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention enables easy soldering of a connector to a camera side to a printed wiring board incorporated in an interchangeable lens, etc., and can be carried out at low cost. The present invention relates to a method for supporting a rigid printed wiring board.

[Prior Art] A conventional lens barrel has a configuration as shown in FIG. 3, for example.

In FIG. 3, reference numeral 1 denotes a fixed barrel (lens barrel), and a bayonet mount IA is attached to one end of the fixed barrel on the camera side to be connected to a camera (not shown).

The back focus adjustment at this time will be described later with reference to FIGS. 4 to 7.

Further, referring to FIG. 3, the thickness D of the fastening flange lAa of the mount IA is formed to be thicker than the final thickness d in consideration of the back focus adjustment method. The back surface of the fastening flange part IAa is the reference plane I for back focus measurement and back focus adjustment.
Ab, and a screw insertion hole (blind hole) opening in the reference surface IAb is provided through the fastening flange portion IAa.

The mount IA has a front shape and a cross-sectional shape as shown in FIGS. 6 and 7, and has the same structure as a known mount.

The fixed tube 1 fastened to the mount IA has a screw hole on its rear end surface that matches the screw insertion hole of the mount IA, and the screw IB is screwed into the screw hole through the screw insertion hole. As a result, the mount IA and the fixed cylinder 1 are fastened together.

While manufacturing the fixed barrel 1 having a structure in which the distance 1lIltyJ and the helicoid barrel are integrated, the back focus of the fixed barrel 1 is adjusted as follows.

That is, after a bayonet mount IA, which is a dummy mount having a standard thickness, is temporarily fastened to the fixed tube 1 with screws IB, the fixed tube 1 is attached to a collimator and the back focus (BF) is measured.

In this case, the thickness D of the fastening flange portion IAa of the mount IA is designed in advance to be thicker than the thickness d corresponding to the back focus value obtained by measurement (the thickness d is a different value for each back focus measurement value). ), the fastening flange portion IAa of the mount IA is
It turns out that a mount with dimensions d=D-j2 with a reduced thickness is suitable. Therefore, after removing the mount IA from the fixed tube 1, as shown in FIG. The thickness is set to a predetermined value d. Cutting is carried out by mounting the mount IA' on a lathe, milling machine, etc., and using the reference plane IA'b as a reference.

If the mount IA' whose fastening flange portion IA'a is cut to have a thickness d is fastened to the fixed barrel 1, a lens barrel assembly adjusted to a predetermined back focus will be obtained.

Furthermore, in FIG. 3, 2 is the first moving ring, and 4 is the second moving ring.
is a moving ring, each with focusing lenses L4 to L6.
Retain %Ll~L3. A fitting part 4a that fits with the inner diameter part 2a of the N1 moving ring 2 is provided on the outer peripheral surface of the second moving ring 4,
and a fixing means for fixing the second movable ring 4 to the movable ring 2. The fixing means includes a plurality of protrusions 4b protruding from the outer periphery of the second movable ring 4.

4b, . . . are engaged with the engaging portions 2b, 2b, .

Reference numeral 6 denotes a motor held in the fixed cylinder 1, which consists of a stator consisting of yokes 6a, 6a2, permanent magnets (not shown), etc. fixed to the fixed cylinder 1, and a rotor consisting of a coil, a rotating shaft 6b, etc. ing. 01 to Gn indicate gear groups constituting a gear mechanism that increases and decreases the number of rotations in conjunction with the rotating shaft 6b, and the gear groups G and Gn are pivotally supported by a base plate 8 fixed to the fixed cylinder 1.

10 is a rotating ring that rotates at a fixed position of the fixed cylinder 1;
The inner diameter of the rotary ring 10 is provided with a helicoid portion 10a that screws into the helicoid portion 2c formed on the outer periphery of the first moving J ring 2, and the outer periphery of the rotary ring 10 is provided with a V-shaped portion that receives the bearing balls 12. A shaped ball race groove 10b is formed.

The bearing ball 12 is inserted into the ball race groove 10 of the rotating ring 10.
(b) are arranged successively or at regular intervals by a ball spacer 14, are fitted inside the fixed cylinder 1, and have an inclined surface at one end.
The ball holder includes a ring 16 and a threaded portion 1 on the inner surface of the fixed cylinder 1.
It is held by a second ball receiving ring 18 which is threadedly engaged with a.

Reference numeral 20 denotes a plate-shaped spacer provided between the ball receiving ring 16 and the fixed cylinder 1, and the pressing force of the ball 12 is adjusted by changing the plate thickness.

22 is a position detector such as an encoder disposed within the gear mechanism. Further, a part of the outer periphery of the rotary ring 10 is made small in diameter, and a gear ring 24 is fixed to the outer periphery of the small diameter portion 10c, and the gear ring 24 is threadedly engaged with the output gears of the gear groups 01 to Gn.

In the above configuration, between the movable cylinder yJ2 and the fixed cylinder 1,
Motor 6 and gear group G! A space is formed so that ~Gn can be stored and arranged, and this space is used for the bearing components of the rotating ring 10, the ball bearing ring 16, and the balls 12, 12, . . . It is held by a ball receiving ring 18.

Further, Dl is a diaphragm unit fixed to the inner peripheral surface of the movable ring 2 and the small diameter wall 2e, and EMD is a motor for driving the diaphragm unit D1, and this motor EMD is fixed to the inner peripheral surface of the movable ring 2. .

Reference numeral 30 denotes a rigid printed wiring board having a drive control circuit for the motor 6 and the EMD, and a flexible printed wiring board (not shown) connects the motor 6, the EMD, and the rigid printed wiring board 30. 3! l12
The elastic member 32 is fixed to the movable ring 2 so as to press it against the movable ring 2. Reference numeral 31 denotes a contact block for transmitting and receiving electrical signals with the camera body (not shown), which is soldered (soldering is done in section 31a).
This electrically connects the hard printed wiring board 30 and the contact block.

29 is a back cover that fits into the inner diameter of the mount IA.

As described above, the thickness d of the flange portion of the mount IA is determined by adjusting the back focus. The determined thickness d changes depending on the individual lens barrel, and the contact block 31 attached to the mount IA moves in the optical axis direction with respect to the fixed barrel 1 by the amount that the thickness changes. As the contact block 31 moves, the soldering portion 31a moves in the optical axis direction. Since the hard printed wiring board 30 is fixed to the fixed cylinder 1 via the elastic member 32, the soldering is performed by changing the elastic member 32 as the part 31a tightens.
The rigid printed wiring board 30 moves in the optical axis direction, and the soldering portion 31a can always be in contact with the rigid printed wiring board 30.

[Problem to be solved by the invention] In the conventional technology explained in FIGS. 3 to 7,
There are the following problems.

First, until the hard printed wiring board 30 is soldered, it is only sandwiched between the elastic member 32 and the connection plate and is not firmly fixed, so when soldering, an automatic soldering machine or the like is not used. If it is applied from above, the hard printed wiring board 30 will sink, making it impossible to solder.

Secondly, since the wiring board 30 is fixed via the elastic member 32, it is necessary to incorporate the wiring board 30 so as to crush the elastic member 32 from above the elastic member 32, and the structure is also complicated. Also, it is difficult to assemble and costs are high.

Thirdly, since the entire hard printed wiring board 30 moves, it is necessary to escape by the amount of movement of the wiring board 30, and when it is installed in a narrow space such as an interchangeable lens, tall chips etc. cannot be attached.

The present invention attempts to solve the above problems. That is, the present invention facilitates soldering work, improves its reliability, eliminates the need for elastic members, simplifies the structure, facilitates assembly, and reduces costs. It is an object of the present invention to provide a method for supporting a rigid printed wiring board that can be used.

[Means for Solving the Problems] In order to achieve the above object, the method for supporting a rigid printed wiring board of the present invention includes a rigid printed wiring board, a support member for supporting the rigid printed wiring board, and a support member for supporting the rigid printed wiring board. In a support structure for a rigid printed wiring board comprising an electrical component to be soldered to a rigid printed wiring board, a soldering part for the electrical component is provided on one side of the rigid printed wiring board, and a soldering part for the electrical component is provided on one side of the rigid printed wiring board. A supporting method is adopted in which the contact portion with the support member is provided near the perpendicular bisector of the line connecting the one side and the other side opposite thereto.

[Function] According to the present invention, the soldering part of the electrical component is provided on one side of the rigid printed wiring board, and the contact part with the supporting member of the rigid printed wiring board is provided on the one side and the other side opposite to the soldering part. Place it near the perpendicular bisector of the line connecting the sides, and press the unsoldered side only during soldering to prevent the soldering part from pressing against the hard printed wiring board with excessive force or floating. This allows for close contact without any problems, making soldering work easier and reliability improved.

[Example code] FIG. 1 shows a first embodiment of the invention.

In Fig. 1, 1 is a fixed barrel (lens barrel) as a supporting member.
, 30 is a hard printed wiring board, and 31 is a contact block.

That is, the hard printed wiring board 30 is passed through the protruding part 1c of the fixed cylinder 1, and the soldering is carried out at the end 30 of one side near the part 31a.
a, and the soldering part 31a is movably supported in a seesaw shape with the abutment part 1b of the fixed cylinder 1 as a fulcrum near the perpendicular bisector of the line connecting the end 30b of the other side away from the part 31a. ing. The contact block 31 is used to exchange electrical signals with the camera body (not shown), and is electrically connected to the hard printed wiring board 30 through a soldered portion 31a.

Here, to repeat the explanation regarding the adjustment described above, the thickness d of the fastening flange portion IAa due to back focus adjustment
Due to this variation, the contact block 31 moves eight times in the optical axis direction. Due to the 8th shift due to this variation, soldering was done in part 31.
a also moves. Hard printed wiring board 30 by this amount of movement
By tilting, soldering can be performed in close contact with the hard printed wiring board 30 without the part 31a pressing against the hard printed wiring board 30 with excessive force or floating.

When soldering, by pressing the vicinity of the end 30b with an appropriate force, the soldering iron presses the soldering part 31a, and the soldering part 31a separates from the hard printed wiring board 30 and floats. disappears.

FIG. 2 shows a second embodiment of the invention.

In FIG. 2, 33 is a hard printed wiring board, and the contact block 31 is soldered to the end 33 of one side near the part 31a.
A tall electrical component (
An electronic component) 33C is disposed and supported in a seesaw manner on the fixed cylinder 1 via the electrical component 33c.

Therefore, as in the first embodiment, the contact block 31 moves in the optical axis direction by adjusting the back focus. As the contact block 31 moves, the soldering is carried out at part 3.
1a moves in the optical axis direction. The hard printed wiring board 33 moves in a seesaw manner with the electric component 33c as a fulcrum, so that the soldering can be brought into close contact with the portion 31a.

When soldering, by pressing near the end 33b on the side opposite to the soldering part 31a, the soldering iron will push the soldering part 31a and connect the hard printed wiring board 33 and the contact block. 31 will not separate from each other, and defective soldering can be prevented.

[Effects of the Invention] As explained above, according to the present invention, the soldering part of the electrical component is provided on one side of the rigid printed wiring board, and the contact part with the support member of the rigid printed wiring board is Since it is placed close to the perpendicular bisector of the line connecting one side and the opposite side, the soldering part will not press against the hard printed wiring board with excessive force or come loose, and will adhere tightly. This makes soldering work easier and improves reliability. It also eliminates the need for conventional elastic members, which simplifies the structure and makes it easier to assemble, reducing costs. be able to.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway elevational view showing a first embodiment of the present invention;
Fig. 2 is a partially cutaway elevational view showing the second embodiment, Fig. 3 is a sectional view showing an example of the conventional technology, Fig. 4 is an explanatory diagram of back focus adjustment, and Fig. 5 is the same. Another explanatory diagram, FIG. 6, is a front view of the mount shown in FIG. 3, and FIG. 7 is a cross-sectional view taken along the cutting line ■--■ in FIG. 6. 1...Fixed tube 1b...Abutment part IC・
・Protrusion 30 ・Hard printed wiring board 31 ・Contact block 31a ・Soldering part 33
...Hard printed wiring board 33c...Electrical components Fig. 3

Claims (1)

[Claims] 1. A rigid printed wiring board support structure comprising a rigid printed wiring board, a support member for supporting the rigid printed wiring board, and an electrical component soldered to the rigid printed wiring board. A soldering part is provided on one side of the rigid printed wiring board, and the contact part of the rigid printed wiring board with the support member is located near a perpendicular bisector of a line connecting the one side and the other side opposite thereto. A method for supporting a rigid printed wiring board, characterized in that: