TWI383657B - Method of manufacturing light source of contact image sensor module - Google Patents

Description

Method of manufacturing a light source of a contact image sensor module

The present invention relates to a contact image sensor module (CISM), and more particularly to a method of manufacturing a light source of a contact image sensor module.

At present, most of the scanners use a contact image sensor module as a sensing element for scanning. The contact image sensor module is mainly composed of a light source, a lenticular lens and a sensor. When the scanner starts scanning, the light source illuminates the generated light to the object to be scanned or the file to be scanned, and after the light of different intensity is reflected by the object to be scanned or the file to be scanned, such as a dark area, a small amount of light is reflected. The bright area reflects a large amount of light, etc., and the lenticular lens focuses the light of different intensity reflected onto the sensor of the same width as the scanning plane, and the sensor converts the light of different intensity into an analog electrical signal. The analog electrical signal is proportional to the light intensity. Finally, the analog electrical signal is converted into a digital electrical signal and then processed through appropriate imagery to generate information of the object to be scanned or the file to be scanned.

The quality of the scanned image depends on the advantages and disadvantages of the contact image sensor module. As described above, the contact image sensor module is illuminated by the light source to the object to be scanned or the file to be scanned, and is scanned by the reflected light. Image, so the light source is quite important. At present, the manufacturing method of the light source is first performed according to the size of the light source required by the customer, and the Photo Response Non-Uniformity (PRNU) simulation is performed. After the simulation result reaches the predetermined specification, the simulated dot pattern is drawn. Mold processing. After processing, measure whether the finished product is equivalent to the simulated dot pattern. After confirming that the finished product is equivalent to the simulated dot pattern, the mold is installed on the mold and then the upper mold is injected, and the parameters of the injection machine are adjusted. When the injection machine parameters reach 95% of the dot pattern replication rate, the finished product will be shot. The Light Guide is mounted on the designed light source housing to complete the manufacture of the light source. At this time, the manufactured light source is assembled to the contact image sensor module, and the actual machine is verified whether the light uniformity of the predetermined specification is achieved. If the actual machine verification does not reach the light uniformity of the predetermined specification, it is necessary to restart from the earliest light uniformity simulation, and repeat the above steps until the real machine verifies that the light uniformity of the predetermined specification is reached.

However, the above-mentioned conventional light source for manufacturing the contact image sensor module has the disadvantage that only one size can be designed for the whole process. If a special size light source is required, it must be simulated from the light uniformity, the drawing, the mold processing, and the upper The process of injection molding, mounting to the light source base, assembly to the contact image sensor module, and real machine verification is repeated until the specification is reached. The above process requires a relatively high cost, including the purchase of related optical simulation software (such as traspro light tool) and the cost of standard luminosity measuring instrument, mold opening cost, etc., and the development process is cumbersome, and it takes a lot of time to verify.

Therefore, it is necessary to propose a solution to the above problems.

It is an object of the present invention to provide a method of fabricating a light source for a contact image sensor module that can produce a light source of a contact image sensor module of a desired size in a low cost and simple process.

The method for manufacturing a light source of a contact image sensor module according to the present invention comprises the following steps:

(1) providing a main light source, the surface of the main light source having a dot and having a light source on one side;

(2) removing a plurality of dots of a predetermined length of the main light source to form a plurality of dotless regions on the main light source;

(3) cutting the main light source to form a first cutting segment light source and at least one second cutting segment light source, wherein the first cutting segment light source and the second cutting segment light source each comprise a dotless region, And the first crop segment source comprises a point source;

(4) Combining the second cropped light source with another point source.

In addition to the above steps, the method for manufacturing the light source of the contact image sensor module of the present invention further comprises the following steps:

(5) assembling the first cutting segment light source and the second cutting segment light source into a contact image sensor module;

(6) Measure the light uniformity of each contact image sensor module.

The above manner of removing the dots is carried out, for example, by using a tape to adhere to dots of a predetermined length. In another embodiment, the dots are removed by polishing a dot die.

The above predetermined length ranges from 6 mm to 10 mm, with a preferred value of 8 mm.

Compared with the prior art, the method for manufacturing the light source of the contact image sensor module can cut a low-cost standard-size light source to produce a light source of a desired size, without the prior art simulation and opening. High-cost and time-consuming processes such as modulo and verification.

The above and other objects, features, and advantages of the present invention will become more apparent and understood.

The technical contents of the present invention will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 and FIG. 2A to FIG. 2D together. FIG. 1 is a flow chart showing a method for manufacturing a light source of a contact image sensor module according to the present invention, and FIGS. 2A to 2D are diagrams. A schematic diagram of a light source for fabricating a contact image sensor module in accordance with the present invention. The method of the present invention comprises the following steps:

In step S10, a main light source 20 is provided, the surface of which has a dot 28 and a light source 22 on one side, as shown in Fig. 2A. The point source 22 is, for example but not limited to, a light emitting diode. The primary light source 20 is the lowest priced standard size light source, such as the A4 size, which has a length of 218 millimeters (Millimeter).

In step S20, the plurality of dots 28 on the predetermined length L of the main light source 20 are removed, so that a plurality of dotless regions 24 are formed on the main light source 20. The purpose of removing the dots 28 will be explained in more detail later. The result after removal is as shown in Fig. 2B. The manner in which the dots 28 are removed may vary depending on the manner in which the dots 28 are formed. When the dots 28 are formed by screen printing, the dots 28 on the predetermined length L can be adhered with a tape to achieve the purpose of forming the dotless regions 24. When the halftone dots 28 are formed by injection molding, the dot molds (not shown) on which the dots 28 are formed are polished at a predetermined length L, and the manufactured main light source 20 has no dots at a predetermined length L. The purpose of forming the dotless area 24 is achieved.

In FIG. 2B, the size of each predetermined length L is equal. Of course, the size of the predetermined length L may be adjusted to be unequal according to actual needs, that is, the size of the no-dot area 24 is different. The range of the predetermined length L is comprised between 6 mm and 10 mm. In the preferred embodiment, the predetermined length L is 8 mm.

In step S30, the main light source 20 is cut along the broken line of FIG. 2B, and the result of the cutting is as shown in FIG. 2C, and the first cutting segment light source 30 and the second cutting segment light source 40 are formed, wherein the first cutting is performed. Each of the segment light source 30 and the second crop segment light source 40 includes a dotless region 24, and the first segment segment source 30 includes a point source 22. Taking the A4 size of the above-mentioned length of 218 mm as an example, it can be cut into an A6 size of 108 mm in length and an A8 size of 54 mm in length to obtain a light source of two different lengths of A6 size and A8 size. Another cutting method can cut the A4 size of 218 mm in length into A5 size of 140 mm in length and A8 size of 54 mm in length, which can obtain two different lengths of light of A5 size and A8 size. . Because the A4 size is the standard light source size of the contact image sensor module used in the industry, in addition to cutting the A5, A6 or A8 size light source, the standard size can be cut to any length according to customer requirements. Light source.

At present, when the mass production of the main light source 20 of the standard size of FIG. 2A is mass-produced, the technique of removing the dots is not used, that is, the surface of the entire main light source 20 is covered with dots. Therefore, if the main light source 20 is directly cut without going to the half point 28 of the predetermined length L of FIG. 2B, severe scattering occurs on the cutting side, that is, the cut side light is too bright. In fact, solving the scattering phenomenon generated on the cutting side can assemble the cut light source into the contact image sensor module, and then stick the optical attenuation film material such as the diffusion sheet on the cutting side to solve the cutting. The problem of cutting side scattering phenomenon. However, the method of adhering the diffusion sheet must be tested to determine the size and transmittance of the desired diffusion sheet. After adhering to the upper side of the cut side, the light uniformity test is performed to finely adjust the light transmittance of the diffusion sheet. Further, since the diffusion sheet is artificially adhered, when there is an error in the upper side of the cutting side, the effect of suppressing the scattering phenomenon is also discounted.

In order to avoid the above problems caused by using the diffusion sheet, the present invention removes the halftone dots 28 on the predetermined length L before cutting, and after the main light source 20 is cut into the first cutting segment light source 30 and the second cutting segment light source 40, The no-mesh area 24 on both sides of the first cropping section light source 30 and the second cropping section source 40 prevents the problem of scattering. In short, the dotless region 24 has the same effect as the adhesive diffusion sheet, but the test, the size and transmittance of the desired diffusion sheet, and the fine adjustment of the transmittance of the diffusion sheet are no longer required. It also avoids the error caused by manual adhesion and saves the cost of using the diffusion sheet. Therefore, the manner in which the dot-free region 24 is formed is simpler than the method of adhering the diffusion sheet and can reduce the production cost.

In step S40, as shown in Fig. 2D, the second cropping segment light source 40 is combined with another point source 26. Since the first cutting segment light source 30 has the point source 22 of the main light source 20, it is not necessary to additionally combine with another point source 26, and the second segment segment source 40 does not have the point source 22 of the main source 20 after cutting. Therefore, it must be additionally combined with another point source 26 as a source of light, and there is no limitation on which side of the second section of the source 40 is incorporated. In one implementation, the other point source 26 is a diode package, which can be fabricated using the prior art and is generally known in the art and will not be described again.

It should be noted that the present invention is not limited to cutting into two segments, and can be cut into multiple segments according to actual needs. For example, by cutting into three segments, a first segmented segment light source 30 and two segments of the second segment segment source 40 can be formed, wherein only two segments of the second segment segment source 40 need to be additionally combined with another point source 26. .

In an embodiment, the second cutting light source 40 is combined with another point light source 26 to further comprise the steps of: providing a glue (not shown); and adhering the adhesive to one side of the second cutting segment light source 40; And attaching another point source 26 to the adhesive side of the second cutting segment source 40.

In still another embodiment, the second cut light source 40 and the other point light source 26 are fixedly coupled by mutual snapping. However, the manner of bonding is not limited to the above-described adhesion or snapping method.

In step S50, the first cutting segment light source 30 and the second segment segment light source 40 are respectively assembled into a contact image sensor module (not shown).

In step S60, the light uniformity of each contact image sensor module is measured, and the test is performed to meet the required specifications.

The first cutting segment light source 30 and the second segment segment source 40 are translucent, and their function is to convert the point source 22 and the other point source 26 into line sources, respectively.

Please refer to FIG. 3 , which is a schematic diagram of the contact image sensor module 50 . The contact image sensor module 50 includes a plurality of lenses 52 housed in the susceptor 54, a first cropped segment light source 30 of FIG. 2D, and a sensor (not shown) below the lens 52. The contact image sensor module 50 can be applied to optical devices such as multifunction printers, scanners, fax machines, or photocopiers.

Compared with the prior art, the invention has the following advantages: (a) the main light source of the standard size can be cut according to requirements, and then the light source is assembled to form a plurality of light sources of different sizes, which can eliminate the need for continuous verification and mold opening. The process greatly reduces the production cost; (b) suppressing the scattering problem on both sides of the light source by means of dot removal can simplify the process, eliminate the cost of using the diffusion sheet and the error caused by human adhesion.

While the present invention has been described above by way of example, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. Other different embodiments are contemplated, and the scope of the present invention is defined by the scope of the appended claims.

20. . . Main light source

twenty two. . . point Light

twenty four. . . No dot area

26. . . Another point source

28. . . Network

30. . . First cutting segment light source

40. . . Second cutting segment light source

50. . . Contact image sensor module

52. . . lens

54. . . Pedestal

L. . . Scheduled length

S10~S60. . . step

1 is a flow chart showing a method of manufacturing a light source of a contact image sensor module according to the present invention;

2A to 2D are schematic views showing a light source for manufacturing a contact image sensor module according to the present invention;

Figure 3 is a schematic diagram showing a contact image sensor module.

S10~S60. . . step

Claims (12)

A method of manufacturing a light source of a contact image sensor module, comprising: (1) providing a main light source having a dot on a surface thereof and having a light source on one side; (2) removing a plurality of predetermined ones of the main light source a dot of a length such that a plurality of dot-free regions are formed on the main light source; (3) cutting the main light source to form a first cropping segment light source and at least a second cropping segment light source, wherein the first cropping segment The light source and the second cutting segment light source each include a no-dot region, and the first cutting segment source includes the point source; and (4) combining the second segment segment source with another point source. The method of claim 1, further comprising: (5) assembling the first cutting segment light source and the second cutting segment light source into a contact image sensor module; and (6) Measuring the light uniformity of each contact image sensor module. The method of claim 1, wherein the dots are removed by adhering to the predetermined length with a tape. The method of claim 1, wherein the dot is removed by polishing a dot die. The method of claim 1, wherein each predetermined length is equal in size. The method of claim 1, wherein each predetermined length is unequal in size. The method of claim 1, wherein each predetermined length comprises a range of from 6 mm to 10 mm. The method of claim 7, wherein each predetermined length is 8 mm. The method of claim 1, wherein the point source is a light emitting diode. The method of claim 1, wherein the other point source is a light emitting diode. The method of claim 1, wherein in the step (4), the method further comprises: providing a glue; attaching the adhesive to one side of the second cutting segment light source; and the other point light source Adhered to the adhesive side of the second cutting segment light source. The method of claim 1, wherein in the step (4), the second cutting segment light source and the other point source are mutually snap-fastened.