JPS6226875A - Light-emitting diode unit - Google Patents

Abstract

PURPOSE:To construct an LED unit in a simplified and compacted manner, by arranging the LED arrays with the center lines of their light-emitting sections coincident with the center line of an elongated substrate, and by forming electrodes on the alternate sides in the direction of the width of the substrate while providing a drive means for driving the adjacent LED array in the region where no electrode is formed. CONSTITUTION:LED arrays 12a, 12b... are arranged such that their electrode forming sections are directed alternately to the opposite directions and that the centers of their light-emitting sections are aligned along the same line. In other words, they are arranged in zigzags along the center line, for example such that the LED array 12a is protruded downward and the LED array 12b is protruded upward. Signals are connected to the protruded sides of the LED arrays. A driving IC 13 is arranged for driving the LED array 12a in the space defined on one side of the LED array 12b. The driving IC 13 is bent perpendicularly so that various patterns are connected thereto. According to this method, free spaces can be utilized effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a light emitting diode (LED) unit,
In particular, it relates to an LED unit used in an LED optical writing head in an optical blink.

(Prior Art) LED units have come to be used as light sources for third optical printers, and examples of this type of LED units include, for example, "Nikkei Electronics, 1981, 5-25. 114 true to 128. page".

[Research and Practical Application Report, Volume 31, No. 3 (1982) 6
Pages 9 to 93, Telecommunications Research Institute.

Figure 4 shows the L used in a conventional optical printer of this type.
FIG. 5 is a partial perspective view of the ED unit and a side view of a conventional optical writing head.

As is clear from these figures, 1a+, 1at.

...1 b++ 1 bt, ... is a large number of element rows,
In other words, it is an LED array package in which LEDs are arranged horizontally and linearly and a plurality of dots are integrated. 2a and 2b are bases, which are used in pairs, and each LE
D array 1 a+-13x,=”l b++ 1 bz
, "' are fixed in a staggered manner along the axial direction of the photosensitive drum 7 to ensure a printing width, and the LEs are arranged in a staggered manner.
It is installed at an angle so that the light emitted from the D array is formed on a photosensitive drum 7, which is a recording surface, on a single straight line while maintaining continuity. Further, 3a+, 3a, . . . are corresponding LED arrays 1a+, 1az.

It is a drive integrated circuit (hereinafter referred to as drive IC) for emitting light, and it is d at, d at, -4b
+.

4b2. ... is the above-mentioned LED array and drive IC
3a1, 3az, . . . are connected in units of light emitting dots, and 5a is the drive IC 3a+, 3az.

It is a bus cable that is located on the input side of ... and connects them in multiple ways.

As shown in FIG. 5, each row of the LED arrays arranged in two staggered rows in this LED unit has two light-condensing Rondo lens arrays 6a, 6 corresponding to each row.
An image is formed on the photosensitive drum 7 at b. The base 2a,
2b and light collecting rod arrays 6a and 6b are arranged.

(Problems to be Solved by the Invention) However, the LED unit having the above configuration has a complicated structure and has manufacturing difficulties.

That is, LED array 1 al+ 18x,=1 b+,
1 bz.

... and drive +C3a+, 3az, ... and cable 4a,, 4a,, -4b+, 4bz,
Base 2a and 2b are units that integrate ``'' respectively.
Just enough to satisfy the printing width required on the top, that is, several tens of μm
A plurality of bases 2a and 2b must be installed with the positional accuracy of the order, and it is also necessary to give angles to the bases 2a and 2b so that their respective light paths converge on the photosensitive drum 7. must be adjusted by. For these reasons, conventional heads require a large number of component parts, required mechanical processing precision, and elaborate assembly, which requires a large amount of man-hours and labor.

The present invention eliminates the above problems and has a simple configuration,
Moreover, it is an object of the present invention to provide an LED unit that can be manufactured easily and is compact.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a light emitting diode unit in which long substrates are prepared, and the center line of the light emitting part is arranged at the center part of a plurality of the substrates. match,
Moreover, the outer shape thereof is arranged in a zigzag shape, and the electrodes are arranged so as to be taken out from one side alternately in the transverse direction of the substrate. Therefore, drive means for the adjacent LED array is provided in the area where the electrodes of the LED array are not taken out.

(Function) According to the present invention, by using the above means, (1)
The layout of each LED array unit can be easily done using the zigzag shape of the LED array as a guide. (
2) The space on one side of adjacent LED arrays can be used effectively, and the film pattern of the electric circuit can be simplified. (3) The space factor on the substrate can be improved.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a plan view of a mounting portion of an LED unit according to the present invention, and FIG. 2 is a schematic overall structural diagram of the LED unit.

In these figures, 11 is a substrate such as ceramic;
2a and 12b are, for example, 64-bit integrated LED arrays, and the gap tolerance chip of the upper joint circuit for printing quality is 30.
Since it is about μm, for example, the integration degree is 9.4 dots.
/m LED array 12a
, 12b has a mounting pinch of 6.815 mm. At this time, the pitch of the light emitting parts of the LED arrays 12a and 12b is 106
.mu.m, which is narrower than the normally possible wire bonding W/B pitch, so patterning is performed so that the W/B positions are alternated.

The details of these dimensions have already been published in
It has been filed and proposed as No.-143479.

In this embodiment, every other LED array 12a, 12b... has electrodes taken out in opposite directions, but the centers of the light emitting parts of the LED arrays 12a, 12b... are arranged on the same line. . That is, in FIG. 1, C/
Zigzag shape with L as the center, that is, LED array 1
The LED array 12a has a downwardly convex shape, and the LED array 12b has an upwardly convex shape.

12b... are each connected to a signal on the convex side, so that the concave side becomes an empty space.

13 is an inner bonded drive IC;
A is the output side connection part of the drive 1c13, and B is the input side connection part. 14 is the Vcc (+) input pattern of the drive ICl3, 15 is the GND (-) of the drive ICl3
Input section (pattern), 16 is common control signal input section (pattern) of drive ICl3, 17 is drive I
This is a chip selection pattern for Cl3, and its pattern 1
The input terminal section 18 of No. 7 is provided near the edge of the substrate 11.

Reference numeral 19 denotes a GND line provided below the LED array 12, which has a width margin in the center so that a large current can be applied.

Here, to explain the case of lighting the LED array 12a, power is supplied to the power supply patterns 14 and 15 described above, and the necessary signals are input to the common control signal input section 16.
For example, by supplying lighting data, a flicker signal, etc., and finally supplying a chip selection signal from the input terminal section 18 for chip selection, the drive ICl3 of the input side connection section B is
The input conditions are set, logic-controlled internally, and the control information given to the common control signal human power section 16 is output from the output side connection section A to the pattern section of the substrate 11, and then the electrodes of the LED array 12a and the control information given to the human power section 16 are outputted to the pattern section of the substrate 11. The LED array 12a is connected from the W/B section connecting the 11 patterns.
is guided by the electrode. From this electrode part, the LED array 12a
The LED array L2a is then turned on or off by being led to the GND line 19 on the lower surface.

As shown in FIG. 2, the substrate 11 is formed in a long shape, and the LED array 12 with the centers of the light emitting parts on the same line as described above is installed in the center of the substrate, for example.
A total of 36 pieces are arranged.

Further, a drive means for driving the LED array 12a is arranged in an empty space on one side of the LED array 12b. That is, the adjacent LED mentioned above
The drive ICl3 is placed in the empty space of the array and bent at right angles to connect various patterns.

With this configuration, a common power supply section and a common signal input section can be formed in a straight line in the longitudinal direction in a part of one base ville, and empty space can be used effectively. .

On the other hand, when aligning the LED arrays 12a, 12b..., the LED arrays are placed on the substrate II on which the film pattern is formed.
The abutment portion 20a has a uniquely determined positional dimension from the center of the light emitting unit of the D arrays 12a, 12b, . . .

LED array 12a,
12b... can be accurately dice-bonded.

The above-mentioned LED unit is suitable for use in an optical writing head of an optical printer, and this point will be explained below.

FIG. 3 is a side view of the optical writing head, in which light emission information from the LED array 12 disposed on the long substrate 11 (condensed to the photosensitive drum 32 via the light-concentrating Rondo lens array 31) is shown. In this case, as is clear from the figure, the LED array becomes compact, and it is only necessary to use a part of the condensing rod 31 to form an image on the photosensitive drum 32. It is easier to assemble than the other heads, and it is possible to obtain a small and inexpensive optical writing head.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible according to the spirit of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) As described in detail above, according to the present invention, the center line of the light emitting part is made to coincide with the longitudinal center part of the elongated substrate, and the outer shape of the elongated substrate is A plurality of LED arrays are arranged in a zigzag pattern, and the electrodes are taken out from one side alternately in the transverse direction of the substrate, and in the area where the electrodes are not taken out from the LED array, the adjacent LED arrays are Since the drive means is provided, (1) each LED array unit can be easily allocated using the zigzag shape from the center line of the LED array as a guide.

(2) The empty space on one side of the LED array in contact with rJ4 can be effectively used for arranging the drive means for the LED array, and the film pattern of the electric circuit can be simplified.

(3) The space factor of the board can be improved overall.

In particular, the LED unit of the present invention has LEDs on one substrate.
Since the light emitting parts of the array are arranged compactly in a line and printing quality can be improved, it is suitable as an optical writing head for an optical printer.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a mounting portion of an LED unit according to the present invention, FIG. 2 is a schematic overall configuration diagram of the LED unit, FIG. 3 is a side view of an optical writing head according to the present invention, and FIG. 4 is a conventional one. FIG. 5 is a partial perspective view of the LED unit and a side view of a conventional optical writing head. 11... Board, 12... LED array, 13...
Drive IC114=Vcc (+) input pattern, 15-GND (-) input pattern, 16...
Common control signal human power section (pattern), 17...
Chip selection section (pattern), 18...Input terminal section for chip selection, 19...GND line, 20...L
ED Abutment part of D array.

Claims (1)

[Claims] A long substrate, the center line of the light emitting part is aligned with the center part in the longitudinal direction of the substrate, and the outer shape is arranged in a zigzag shape, so that electrodes are taken out from one side alternately in the lateral direction of the substrate. 1. A light emitting diode unit, comprising: a plurality of light emitting diode arrays disposed in the light emitting diode array, and drive means for adjacent light emitting diode arrays is provided in an area where no electrode is taken out from the light emitting diode array.