CN2569176Y - Depth of focus adjustment device - Google Patents

Abstract

A focal depth adjusting device is applied to an optical scanner module, the optical scanner module is provided with a bearing box body and an optical sensor, the optical sensor is arranged on a circuit substrate, the circuit substrate is provided with a plurality of through holes, and the focal depth adjusting device comprises a plurality of elastic components and a plurality of screws. Each screw locks the circuit substrate in the bearing box body through one of the through holes, and one of the elastic members is clamped between the bearing box body and the circuit substrate, so that the focal depth positions of the lens and the optical sensor can be adjusted by adjusting the screws and the elastic members.

Description

Depth of focus adjustment device

technical field

The utility model relates to a focal depth adjustment device, in particular to a focal depth adjustment device applied in an optical scanning module.

Background technique

After the input, processing and processing of images has become a popular interest, the scanner has become one of the basic equipment for many computer users. It can scan and input text or image data such as documents, magazines, books, pictures, etc. computer and process it. Among all kinds of scanners, the flatbed scanner is the most commonly used one. In the flatbed scanner, the scanning module is installed under a transparent platform in a way that can be pulled back and forth to scan objects placed on the transparent platform. document. Moreover, the scanning module itself has no power, so it needs transmission mechanisms such as stepping motors, gears, belts, etc. to drive it. When wanting to use a flat-bed scanner to scan a document, the document must be placed on the transparent platform, and then the document cover is covered to press the document flat against the transparent platform, and then scanned.

In the known optical scanning module 100 (please refer to FIG. 1 ), it includes a light source 102 , a mirror assembly 106 , an optical lens 108 , an optical sensor 110 , and a carrying case 112 . The aforementioned light source 102 , mirror set 106 , optical lens 108 , optical sensor 110 , etc. are all disposed in the carrying case 112 . When scanning, the light source 102 irradiates the document 10 on the transparent panel 104 to obtain an image light through reflection or transmission. The mirror group 106 is composed of a plurality of mirrors (106a, 106b, 106c), and is arranged on the optical path of the image light. The reflection is transmitted to the optical lens 108. The optical lens 108 can receive the image light of the document 10 transmitted by the mirror group 106 and form an image on the optical sensor 110 . The optical sensor 110 is a charge coupled device (CCD, Charged Couple Device), and the optical sensor 110 is mounted on a circuit substrate 114 and electrically connected to the circuit substrate 114.

As today's electronic products tend to be thinner and smaller, the size of the scanner is also miniaturized and refined, so that the light cone of the image light projected by the optical lens 108 to the optical sensor 110 is also getting smaller and smaller, making its focus As the depth becomes shallower, the accurate adjustment of the relative position between the optical lens 108 and the optical sensor 110 is more important to obtain the correct focal depth.

The known circuit substrate 114 is usually directly locked on the carrying case 112 with screws (not shown), and the optical sensor 110 is also fixed on the carrying case 112, so it is no longer possible to adjust the optical sensor. 110 and the distance between the optical lens 108. If it is necessary to adjust the focal depth position (that is, the image distance) between the optical lens 108 and the optical sensor 110 , usually it can only be done on the optical lens 108 . However, adjusting the optical lens 108 will simultaneously change the two parameters of the image distance and the object distance (that is, the traveling distance of the light from the document 10 through the mirror assembly 106 to the optical lens 108), thus increasing the difficulty of commissioning and reducing the The accuracy of commissioning.

Utility model content

The purpose of the present utility model is to provide a focal depth adjustment device, which can easily adjust the correct focal depth position of the optical detector, so that the optical sensor can increase the function of adjusting the focal depth position.

In order to achieve the above purpose, the focal depth adjustment device proposed by the utility model is applied in an optical scanner module, the optical scanning module has a carrying box and an optical sensor, and the optical sensor is equipped with On a circuit substrate, and having a plurality of through holes on the circuit substrate, the focal depth adjustment device includes:

a plurality of elastic members; and

A plurality of screws, each screw fixes the circuit substrate to the carrying box through a through hole, and clamps one of the elastic members between the carrying box and the circuit substrate.

In the focal depth adjustment device, the elastic member includes a spring, a fast nut or a reed.

In the focal depth adjusting device, one end of the reed is arranged on the carrying box or integrally formed with the carrying box.

Description of drawings

1 is a schematic cross-sectional view of a known optical scanning module;

Fig. 2 is a schematic cross-sectional view of an optical scanning module in a preferred embodiment of the present invention;

Fig. 3 is a three-dimensional exploded schematic view of the focal depth adjustment device of a preferred embodiment of the present invention;

Fig. 4 is an exploded side view of the focal depth adjustment device of a preferred embodiment of the present invention;

Fig. 5 is a side view of the assembly of the focal depth adjustment device of the preferred embodiment of the present invention;

Fig. 6 is an exploded side view of the focal depth adjustment device of another preferred embodiment of the present invention; and

Fig. 7 is an exploded side view of the focal depth adjustment device of another preferred embodiment of the present invention.

Description of drawings

In order to make the above and other purposes, features and advantages of the present invention more comprehensible, a preferred embodiment will be given below, together with the accompanying drawings, for detailed description.

Detailed ways

Example

Please refer to FIG. 2 , which is a schematic cross-sectional view of an optical scanning module according to a preferred embodiment of the present invention. Similarly, the optical scanning module 200 includes a light source 202 , a mirror set 206 , an optical lens 208 , a carrying case 212 and an optical sensor, such as a charge-coupled device (CCD) 210 . Wherein, the above-mentioned light source 202 , mirror group 206 , optical lens 208 , charge-coupled device 210 , etc. are all disposed in the carrying case 212 . When scanning, the light source 202 irradiates the document 20 placed on the transparent panel 204 to obtain an image light through reflection or transmission. The mirror group 206 is composed of a plurality of mirrors (206a, 206b, 206c), and is arranged on the optical path of the image light. It can guide the image of the document 20 into the mirror group 206, and then transmit it after being reflected by the mirror group 206. To the optical lens 208. The optical lens 208 can receive the image light of the document 20 transmitted by the mirror group 206 and form an image on the CCD 210 .

Please refer to FIG. 3 , which is a three-dimensional exploded schematic view of the focal depth adjustment device of a preferred embodiment of the present invention. It can be seen from FIG. 3 that the optical sensor fixing device of the present invention mainly includes: multiple (two in this embodiment) elastic members and multiple (two in this embodiment) screws 222 . Wherein, the elastic member is, for example, a spring 220 , and the relative positions of one of the springs (elastic member 220 ) and one of the screws 222 are shown in side views in FIGS. 4 and 5 . FIG. 4 is an exploded side view of the focal depth adjustment device of a preferred embodiment of the present invention, and FIG. 5 is an assembled side view of the focal depth adjustment device of a preferred embodiment of the present invention. When the charge coupled device 210 is intended to be assembled on the carrying case 212, first each screw 222 is inserted into one of the through holes 216 on the circuit board 214 of the charge coupled device 210, and then the screw 222 is passed through the spring 220 and locked. It is fixed in the screw hole 218 on the carrying box body 212 . That is, the spring 220 is disposed between the carrying case 212 and the circuit substrate 214 .

In this way, when the depth of focus is to be adjusted, the distance between the CCD 210 and the optical lens 208 can be adjusted by the rotation of the screw 222 and the elastic restoring force of the spring 220 , so as to adjust the correct depth of focus.

In addition to the spring 220, the elastic member of the present invention can also use other different elastic members. Please refer to FIG. 6 , which is an exploded side view of a focal depth adjustment device according to another preferred embodiment of the present invention. Moreover, the components in Fig. 6 are the same as those in Fig. 3, and the same reference numerals are used and their descriptions are omitted. From Fig. 6, it can be seen that the optical sensor fixing device of the present invention mainly includes: a plurality (two in this embodiment) ) elastic member and multiple (two in this embodiment) screws 222. Wherein, the elastic member is, for example, a quick nut 320 , and the so-called quick nut 320 is formed by punching a sheet member to form an elastic part 322 as shown in FIG. 6 by means of a punching machine. When the charge coupled device 210 is intended to be assembled on the carrying case 212, the screw 222 is first inserted into the through hole 216 on the circuit board 214 of the charge coupled device 210, and then the screw 222 is passed through the quick nut 320 and Locked in the screw hole 218 on the carrying box body 212 . That is, the quick nut 320 is disposed between the carrying case 212 and the circuit board 214 .

In this way, when it is desired to adjust the depth of focus, the rotation of the screw 222 is used to adjust the elastic restoring force of the elastic portion 322 of the fast nut 320, so that the distance between the charge-coupled device 210 and the optical lens 208 can be adjusted to match the adjustment The correct depth of focus position.

Please refer to FIG. 7 , which is an exploded side view of a focal depth adjustment device according to another preferred embodiment of the present invention. Also, in FIG. 7, the components are the same as those in FIG. 3, and the same reference numerals are used and descriptions thereof are omitted. It can be seen from FIG. 7 that the optical sensor fixing device of the present invention mainly includes multiple (two in this embodiment) elastic members and multiple (two in this embodiment) screws 222 . Wherein, the elastic member is, for example, reeds 420 , and one end of these reeds 420 is disposed on the carrying case 212 , and these reeds 420 can also be integrally formed with the carrying case 212 . When the CCD 210 is to be assembled on the carrying case 212, the screw 222 is inserted into the through hole 216 on the circuit board 214 of the CCD 210, and locked in the screw hole 218 on the carrying case 212. Inside. That is, the reed 420 is disposed between the carrying case 212 and the circuit substrate 214 .

In this way, when the depth of focus is to be adjusted, the distance between the charge-coupled device 210 and the optical lens 208 can be adjusted by the rotation of the screw 222 and the elastic restoring force of the reed 420 to adjust the correct depth of focus Location.

As can be seen from the above, the elastic member (spring 220, quick nut 320 or reed 420) and the screw 222 of the focal depth adjustment device of the present invention can enable the charge coupled device 210 to correctly adjust its focal depth in a simple mechanism. s position.

According to the above-mentioned preferred embodiments of the utility model, the utility model has at least the following advantages: due to the elastic member arranged between the carrying box and the circuit board, and the simple mechanism design of screw locking, the charge-coupled device can be correctly Adjusting its focal depth position makes it simple and feasible to increase the purpose of adjusting the correct focal depth position of the charge-coupled element.

Although the utility model has been described above with preferred embodiments, it is not intended to limit the utility model, and any skilled person can make some changes and modifications without departing from the spirit and scope of the utility model , so the scope of protection of the present utility model should be defined as defined by the scope of the patent application.

Claims (6)

1. A focal depth adjustment device, applied in an optical scanner module, the optical scanning module has a carrying box and an optical sensor, and the optical sensor is arranged on a circuit substrate, and The circuit substrate has a plurality of through holes, and it is characterized in that the focal depth adjustment device includes: a plurality of elastic members; and A plurality of screws, each screw fixes the circuit substrate to the carrying box through a through hole, and clamps one of the elastic members between the carrying box and the circuit substrate. 2. The focal depth adjusting device according to claim 1, wherein the elastic member comprises a spring. 3. The focal depth adjusting device as claimed in claim 1, wherein the elastic member comprises a quick nut. 4. The focal depth adjusting device according to claim 1, wherein the elastic member comprises a reed. 5. The focal depth adjustment device according to claim 4, wherein one end of the reed is disposed on the carrying box. 6. The focal depth adjustment device according to claim 4, wherein the reed is integrally formed with the carrying box.

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