JPS63104858A - Assembly construction for optical printing head - Google Patents

Abstract

PURPOSE:To contrive a simple construction and a smaller size, by a construction wherein an LED unit incorporated in an elongate base board is abutted by a frame, a base and a flexible printed wiring board, and they are jointed in a body by positioning pins and stopping plates for assembling. CONSTITUTION:An LED unit 20 comprising an LED array and driver an IC therefor mounted on a single elongate base board, a frame 17 fitted with a converging rod lens array 16, a flexible printed wiring board 21 with a connector for controlling the driver IC, and a base 22 for mounting a ceramic substrate thereon are engaged with each other by a lead spring and a block member. With such a construction, the base 22 supports the LED unit 20 at a predetermined position, the frame 17 supports the lens array 16 at a predetermined position, the base 22 and the frame 17 cooperate in supporting the wiring board 21, and stopper members 19 function to assemble these component parts in a body. Thus, construction is simple, and there is no need for adjustment.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrophotographic recording type photo printer,
In particular, it relates to the assembly structure of an optical print head.

[Conventional technology]

Conventional techniques in this field include, for example, "Nikkei Electronics J 1981-5-25.114-12
Page 8, “Research Practical Application Report J VOI.

31, No. 3, pp. 1-93 (Telecommunications Research Institute). Such a conventional device has been used in a photo printer as an optical print head having an optical writing structure.

FIG. 2 is a side view of a conventional optical print head of this type. In the figure, an LED array 1a.

1b each has a plurality of light emitting elements (LEDs). L
The ED array 1a is assembled on a header 2a, and the header 2a is provided on a base 3a.
a is glued or screwed onto the block 4a.

The driver 5a is for driving the light emitting elements of the LED array 1a on a one-to-one basis, and is glued or screwed to a predetermined position of the block 4a, and the terminals of the LED array 1a and the driver 5a are connected by a cable 6a. It is connected.

On the other hand, regarding the LED array 1b, the LED array 1
It is assembled on the header 2b in the same way as a, and this header 2b
is placed on the base 3b, and the base 3b is further glued or screwed onto the block 4b. Then, the terminals of the LED array 1b are connected to the terminals of the driver 5b which are glued or screwed to a predetermined position of the block 4b.
They are connected by a cable 6b.

The frame 7 is for mounting on the printer body, and the metal fittings 8 are provided at both ends of the frame 7 in the front and back directions of the drawing. This metal fitting 8 has dogleg-shaped mounting surfaces 9a and 9b, and a block 4a is mounted on one mounting surface 9a with screws 10a, and a block 4b is mounted on the other mounting surface 9b with screws 10b. LED array 1a
, 1b are arranged in two rows in a pattern along the axial direction of the photosensitive drum 11. The focusing rod lens array 12a is located between the LED array 1a and the photosensitive drum 11, and the focusing rod lens array 12a and the other focusing rod lens array 12b are glued or screwed to the backing plates 13a and 13b, respectively. It's stopped. And guess &1
3a is a screw 14a, and the backing plate 13b is fixed to the metal fitting 8 with a screw 14b. Rotating roller 15 is LE
This is for adjusting the distance between the D arrays 1a, 1b and the photosensitive drum 11.

Next, the operation of the above conventional example will be explained. The optical print head with such a configuration converts light from each light emitting element of the LED arrays 1a and 1b into converging rod lens arrays 12a and 12.
2b, the image is formed on a straight line in the axial direction at point P on the photosensitive drum 11. Therefore, by selectively causing the light emitting elements of the LED arrays 1a and 1b to emit light while rotating the photosensitive drum 11, a latent image can be formed on the photosensitive drum 11. Also, L at the above P point
The optical axes of the ED arrays 'la and 'lb are aligned in order to form a linear image in block 4a.

This is done by slightly moving the stop position of the LED array 4b on the mounting surfaces 9a and 9b of the metal fitting 8 so that the lights of the LED arrays 1a and 'lb are aligned in a straight line.

Note that the height of the rotating roller 15 is adjusted in advance so that the lights of the LED arrays 1a and 'lb match at point P.
Can be assembled.

[Problem that the invention seeks to solve]

However, in the conventional optical print head assembly structure with the above configuration, the number of parts required for assembly is large, and there are also many adhesive parts and screw fixing parts, which not only increases the size of the structure but also makes adjustment difficult and increases the number of assembly steps. The drawback was that there were too many.

Therefore, the present invention eliminates the above-mentioned problems of a large number of assembly parts and complicated adjustment and structure, and provides a compact optical print head assembly structure that has a simple configuration and does not require adjustment. The purpose is to

[Means for solving problems]

This invention relates to an assembly structure of an optical print head, which includes an LED array on a single long base substrate, an LED unit mounting a driver IC for driving the LED array, and a frame having a focusing rod lens array mounted thereon. , a flexible printed wiring board with a connector for controlling the driver IC, and a base on which the ceramic board is mounted.
It is characterized by being integrally constructed by interlocking with leaf springs or block materials.

[Effect]

Since the assembly structure of the optical print head according to the present invention is constructed as described above, the base serves to hold the LED unit in a predetermined position, and the frame serves to hold the convergent rod lens array in a predetermined position. The base and frame work together to hold the connector-equipped flexible printed wiring board therebetween, and the stopper member made of a leaf spring or block material works to assemble them together.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing one embodiment.

As shown in the figure, the assembly structure of the optical print head includes an elongated convergent rod lens array 16, a frame 17 that accommodates the rod lens array along the longitudinal direction, and printer guides 18 that protrude outward from both end surfaces of the frame 17. It includes stop plates 19 attached to both sides of the frame 17.

FIG. 3 is a partial sectional view of FIG. 1. An LED unit 20 is provided at a position facing the convergent rod lens array 16 built into the frame 17. The flexible printed wiring board 21 with a connector is fixed to a base 22, and this base 22 is connected to the frame 17 by a stop plate 19.
Fixed.

FIG. 4 is a plan view of the frame 17, which is necessarily made integrally by aluminum die-casting. Sulins 1 to 23 are formed along the longitudinal direction of the long frame 17, and 3
holes 24 are formed, and a first connector relief 25 is formed roughly at the central end. The bottom side 26 is formed integrally with the frame 17.

FIG. 5 is a partial sectional view of FIG. 4. First presser surface 27
The second pressing surface 28 is formed with a step on the upper surface of the frame 17, and a lens positive 29 is provided at both ends of the sulin 1-23.
is provided. A convergence rod lens array 16 is pushed into the gap between the slits 23 and bonded to the frame 17 so as to abut against the lenses 29 at both ends in the longitudinal direction.

FIG. 6 is a plan view of the base 22 shown in FIG.
The figure is a side view of the base 22. 3 driving pins 30
are inserted into the three holes 24 of the frame 17 shown in FIG. 4, and serve to position the LED unit 20. The second connector relief 31 provided on the side surface of the center portion of the base 22 corresponds to the first connector relief 25 shown in FIG.

FIG. 8 is a front view of the flexible printed wiring board 21 with a connector, FIG. 9 is a back view thereof, and FIG. 10 is a side view thereof. As shown in FIG. 8, a VDD table pattern 32 and a control system table pattern 33 are provided on the surface of the long flexible printed wiring board 21 with a connector, and a long handling frame 34 along the longitudinal direction, Two guide holes 35 are formed. Furthermore, a plurality of through holes 36 are formed at the ends of the patterns 32 and 33.

Further, as shown in FIG. 9, a GND back pattern 37 is provided on the back side of the long flexible printed wiring board 21 with connector
A VDD back pattern 38 and a control system back pattern 39 are formed. The side part of the GND back pattern 37 is GN
It forms the D pressure contact part 40, and the side surface of the VDD back pattern is VD.
It forms a D pressure contact part 41.

Further, as shown in FIG. 10, a connector 42 extends perpendicularly from the connector-attached flexible printed wiring board 21, and this connector 42 is fixed to a flexible printed wiring board 43 via a reinforcing plate 44.

The optical print head is controlled by guiding signals from the connector 42 to a flexible printed wiring board 43 connected by soldering. VDD table pattern 3 in Figure 8
2 is the VDD back pattern 3 in Figure 9 from the through hole 36.
8, and the control system front patterns 33 in FIG. 8 are individually connected to the control system back patterns 39 in FIG. 9 through the through holes 36. These control systems are treated as, for example, clock, data, load, IC, and GND signals. This flexible printed wiring board with connector 2
1 is positioned by aligning the guide hole 35 with the driving pin 30 of the base 22.

FIG. 11 is a plan view of the LED unit 20.

On the ceramic substrate 45, an LED array 46 serving as a light source for the optical print head is provided along the longitudinal direction, and a driver IC 4 for driving the LED array 46 is provided.
7 is provided parallel to this.

Furthermore, the LE and ED arrays 46 are parallel to the L and ED arrays 46.
A GND pattern 48 of the D array 46 is provided, and a VDD pattern 4 necessary for power input of the driver IC 48 is provided.
9 are provided along the longitudinal direction. Ceramic substrate 45
At both ends of the LED array 4, several thousand dots are lined up.
A control system pattern 50 is provided for controlling 6 as a printing line.

Next, the operation of the above embodiment will be explained. To assemble this as an optical print head, a base 2 with a flat surface is required.
The end surface of the LED unit 20 (FIGS. 3 and 11) abuts against the endmost pin 30 (the rightmost pin 30 in FIG. 6) of the three driving pins 30 provided on the LED unit 20 (FIGS. 3 and 11). At this time, in order to efficiently dissipate the heat generated during actual operation of the LED unit 20, it is possible to apply a small amount of silicone paste for heat dissipation to the contact surface of the LED unit 20 of the base 22, and to position it by abutting it. .

Next, two guide holes 35 (see FIG. 8) at symmetrical positions are driven into the pins 30 (see FIG. 6) so that the back pattern (see FIG. 9) of the flexible printed wiring board with connector 21 comes into contact with the LED unit 20. ) on base 22. At this time, the connector 42 (FIG. 10) escapes as if accommodated in the second connector relief 31 (FIG. 6), and the L
The ED array 46 and driver IC 46 (FIG. 11) are separated by the handling frame 34 (FIG. 8).

In addition, the GND pressure contact portion 40, the VDD pressure contact portion 41, and the extension portion of the control system back pattern 39 (FIG. 9) are connected to the LE
The position is determined so that it comes into contact with the GND pattern 48 and VDD pattern 49 of the D unit 20, and the tip of the control system pattern 50 (FIG. 11). The reinforcing plate 44 extends in the longitudinal direction of the flexible printed wiring board 43 (10th
(Fig. 3), and when assembled into the base 22, it comes into contact with the surface of the base 22 (Fig. 3).

Next, a plate-shaped silicone rubber is attached to the first holding surface 27 (FIG. 5) of the frame 17 in which the focusing rod lens array 16 is incorporated. For this purpose, a molded double-sided adhesive material with a thickness of about 0.5 m may be used, but it is also possible to use a thread-like silicon wire. In this case, it is necessary to shape the first pressing surface 27 into a semicircular shape.

Next, when this frame 17 is faced to the base 22 so as to match the outer shape of the base 22 (Fig. 3), the base 22 is inserted into the two holes 24 (Fig. 4) provided in the frame 17.
Two of the two driving pins 30 (FIG. 6) fit together, and the positions of the pins 30 are determined except in the vertical direction. At this time, the optical axis of the LED array 46 and the lens array 1
The position of the LED array 46 on the ceramic substrate 45 and the position of the pin 30 are determined so that the linearity of the optical axes of the LED array 46 and the pin 30 match. The terminal group of the connector 42 (Fig. 10) is the first
Relief is provided by the connector relief 25 (Fig. 4).

Next, as shown in FIG. 3, the stopper plate 19 is fitted into the notch of the base 22 and the frame 17, thereby completing the integration and assembly as an optical print head. This stop plate 19 is made of stainless spring steel and has an adhesion strength of 10 to 9 or more on one side, but if there are no restrictions on the shape of the optical print head, a U-shaped clamp can be used on both sides of the frame 17. It is also possible to integrally engage the notch portion and the bottom surface of the central portion of the base 22.

In the optical print head assembled as described above, the reinforcing plate 44 is pressed against the surface of the base 22 by the second pressing surface 28 without wobbling, and thereby the connector 42 is fixed without wobbling, and the bottom side 26 and The interior is sealed by the mating surfaces of the base 22. On the other hand, the inside is connected to the GND pressure contact part 40 of the flexible printed wiring board 43 via a plate-shaped silicone rubber and the VD
The D pressure contact portion 41 and the pressure contact portion (FIG. 9) which is an extension of the control system back pattern 39 are connected to the LED units 1 to 20, respectively.
The GND pattern 48, the VDD pattern 49, and the control system pattern 50 are connected at the pressure contact portion (FIG. 11) which is the tip of the control system pattern 50.

In order to improve the reliability of these press-contact parts, the wide common surfaces of the GND press-contact parts 40 and the VDD press-contact parts 41 of the flexible print 1 to the wiring board 43 are made into a toothed shape as shown in FIG. 9 to improve the contact effect. It's increasing. Also, VD in FIG.
D pattern 49 is 1 at the level of LED units 1 to 20.
It is desirable to separate the individual driver ICs so that their functionality can be tested. In the control system pattern 50, the data line is connected to all driver ICs 47 in series, and the other clock, load, IC, and GND lines are connected to each driver IC 47 in parallel.

In order to implement this optical print head into a printer,
The printer guide 18 (FIG. 1) of the frame 17 allows
The bearing of the printer on the side may be housed in the bearing part. The cross-sectional shape of this printer guide 18 is round, square, or semicircular, and is formed integrally with the frame 17, so that it can connect to the optical axis of the printer and the lens positive direction.
9 can be uniquely determined.

〔Effect of the invention〕

As described in detail above, according to the present invention, the LED unit incorporated in the long base substrate necessary for the optical writing section of the optical printer 1 to the head is abutted by the frame, the base, and the flexible wiring board. Since it has a structure in which the positioning pin and the stop plate for assembly are integrated, the number of parts is small, assembly is easy, and furthermore, there is no need for adjustment. In addition, not only can it be made compact due to its simple structure, but it also has no screws and is dustproof, making it an ideal optical print head for small, inexpensive, and environmentally resistant photo printers. It is possible to apply it.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the structure of an optical print head according to the present invention, FIG. 2 is a side view of a conventional optical print head, FIG. 3 is a partial sectional view of FIG. 1, and FIG. A plan view of the frame shown in FIG. 1, FIG. 5 is a partial sectional view of FIG. 4,
6 is a plan view of the base shown in FIG. 3, FIG. 7 is a side view thereof, FIG. 8 is a front view of the flexible printed wiring board with connector shown in FIG. 3, and FIG. 9 is a back view thereof. FIG. 10 is a side view thereof, and FIG. 11 is a plan view of the LED unit shown in FIG. 3. 1a, 1b-LED array, 2a, 2b-Av holder, 3a, 3b--Base, 4a, 4b--Block, 5a, 5b--Driver, 5a, 6b--Cable, 7- ... Frame, 8... Metal fittings, 9a, 9b... Mounting surface, 10a, 10b... Screws, 11... Photosensitive drum, 12a, 12b... Focusing rod lens array,
13a, 13b--Packing plate, 14a, 14b--Screw, 15--Rotating roller, 16--Focusing rod lens array, 17--Frame, 18--Printer guide, 19--・Stopping plate, 20... LED unit, 21... Flexible printed wiring board with connector,
22... Base, 23... Slit, 24... Hole, 25... First connector escape, 26... Bottom side, 2
7... First presser surface, 28... Second presser surface, 29
...Lens positive, 30...Drive pin, 31...
Second connector escape, 32...VDD table pattern, 3
3... Control system table pattern, 34... Handling frame, 35...
...Guide hole, 36...Through hole, 37...G
ND9i pattern, 38...VDD back pattern, 39
...Control system back pattern, 40...GND pressure contact part, 4
1...VDD pressure contact part, 42...Connector, 43...
・Flexible printed wiring board, 44... Reinforcement plate, 4
5... Ceramic substrate, 46... LED array, 4
7... Driver IC. 48...GND pattern, 49...VDD pattern, 50...control system pattern.

Claims (1)

[Claims] An LED array and a focusing rod lens array are arranged along an optical axis direction perpendicular to a light receiving surface, and an image from the LED array is directed in a straight line to the light receiving surface via the focusing rod lens array. In the assembly structure of an optical print head that forms an image, an LED array consisting of multiple LEDs and a driver IC that drives them are arranged on a single long substrate.
a base on which the LED unit is positioned at a predetermined position by a driving pin; a flexible printed wiring board with a connector having a signal relay part in contact with a signal input part of the LED unit; A cushioning material is installed at the signal relay part of the flexible printed wiring board with a connector, which is positioned and attached by a driving pin, and is assembled integrally with the base by a stopper member made of a plate spring or block material, and is housed inside. 1. An assembly structure for an optical print head, comprising: a frame having a presser part that is pressed into contact with the frame through projections provided at both ends thereof, and a frame that is mounted on a printer through projections provided at both ends thereof.