TW201702557A - Shuttle encoder and optical inspection platform comprising the shuttle encoder - Google Patents

Abstract

An optical inspection platform includes a delivering device, an image capturing device, a vacuum absorbing plane and a shuttle encoder. The delivering device enables conveyor belt to move toward the inspection direction. The image capturing device takes a picture of the conveyor belt direction, thereby determining an inspection area of the conveyor belt. The vacuum absorbing plane offers absorbing power to plural holes of the conveyor belt. The shuttle encoder is used to measure the specific location and conveyor distance of the conveyor belt.

Description

Reciprocating linear encoder and optical inspection platform with reciprocating linear encoder

The invention provides an optical detection platform, in particular to an optical detection platform capable of accurately measuring the position and the travel distance of the transmission belt.

In the field of automation industry, when accurate position positioning is required, it is generally necessary to rely on an encoder to accurately measure the mechanism or device. In addition to position detection, the encoder can accurately measure the angle of rotation and the speed of rotation. , movement rate and acceleration.

Encoders can be mainly divided into two types. One is a Rotary Encoder that converts the rotational position or the amount of rotation into an analog or digital signal. It is usually applied to the rotating shaft and then converted into a linear distance feedback. The other is a linear encoder that converts a linear position or linear displacement into an analog or digital signal, which is commonly used for linear motion distance feedback.

Generally, the conveying distance and the conveying speed of the conveyor belt are calculated, and the rotation angle of the rotating shaft of the conveyor belt is detected by the rotary encoder, and the traveling distance of the conveyor belt is fed back through the circumferential conversion. However, the application of a rotary encoder to a rotating shaft may result in the following uncertainties, resulting in an encoder reading value that is different from the actual walking distance.

First, the error caused by the rotation of the rotation axis is the circumference of the circumference.

2. The deviation and sliding between the rotating shaft and the belt when the static friction is insufficient due to the static friction between the rotating shaft center and the conveying belt.

At present, most of the industrial belt-type optical detecting devices are equipped with a rotary encoder to obtain the actual feedback distance of the rotating shaft through conversion. However, when detecting the object to be tested in the field of optical detection, high precision conditions are often required for the position, moving distance and moving speed of the object to be tested. If the position, moving distance or moving speed of the conveyor belt is in error, it is very It is easy to cause the image obtained during the detection of the flaw to be distorted or misjudged.

The object of the present invention is to solve the problem that when the conveyor belt is combined with the rotary encoder, the position, the stroke distance and the moving speed often have errors, resulting in distortion or misjudgment of the image obtained during the flaw detection. Another object of the present invention is to solve the problem that the length of the encoder strip of the conventional linear encoder cannot be matched with the actual measurement. The measured length of the linear encoder of the present invention can be larger than the length of the strip itself.

The present invention provides a reciprocating linear encoder for measuring a travel distance of a conveyor belt. The linear encoder comprises a code strip located on one side of the conveyor belt, a slider disposed on a track and moving through the track, and a slider disposed on the slider for clamping the position of the conveyor belt a mechanism, and an encoder read head fixed to the positioning mechanism. When the stroke distance is equivalently measured, the positioning mechanism is attached to the conveyor belt at a starting position, thereby moving through the track, and The conveyor belt is moved to a predetermined critical position. After the positioning mechanism moves the critical position from the starting position, the positioning mechanism leaves the conveyor belt and returns to the starting position through a resetting device.

Another object of the present invention is to provide an optical inspection platform having the above-described reciprocating linear encoder, comprising a conveying device, an image pickup device, a vacuum suction device, and a reciprocating linear encoder. The conveying device comprises a conveyor belt having a plurality of through holes and an axle, and a first driving device for driving the conveyor belt to move in a detecting direction. The camera device is disposed on one side of the conveyor belt and is photographed in the direction of the conveyor belt, thereby defining a region to be tested on the conveyor belt. The vacuum suction device is disposed on the other side of the conveyor belt relative to the area to be tested. The vacuum leveling device has a gas guiding surface corresponding to the plurality of through holes to provide an adsorption force to the plurality of through holes. The reciprocating linear encoder is disposed on one side of the conveyor belt. The reciprocating linear encoder clamps the conveyor belt by the positioning mechanism to obtain the travel distance of the conveyor belt.

Further, the types of the linear encoder include an optical linear encoder, an electromagnetic linear encoder, and a resistive linear encoder.

Further, the code strip has a plurality of position codes, and the encoder read head feeds back the position code to the operation unit to calculate the travel distance of the conveyor belt by the operation unit. .

Further, the resetting device includes a fixing mechanism coupled to the slider and having a combined state and a separated state, a guide rail provided by the fixing mechanism, and a connecting mechanism fixed to the bracket to control the fixing mechanism to be displaced on the rail a second driving device, the encoder reading head returns a reset command to the computing unit when detecting that the positioning mechanism moves to the critical position, and the operating unit causes the positioning mechanism when receiving the resetting instruction The conveyor belt is released, and the fixing mechanism is coupled to the slider, and the second driving device is activated to drive the slider to return to the starting position.

Further, the second driving device is a synchronous motor, an induction motor, a reversible motor, a stepping motor, a servo motor, a linear motor, or a cylinder.

Further, the vacuum suction device comprises a vacuum chamber, a plurality of air holes disposed on one side of the vacuum chamber, and a side disposed on the vacuum chamber and providing a negative pressure to the vacuum chamber. A plurality of pores form a vacuuming unit of the gas guiding surface.

Further, the first driving device is an induction motor, a reversible motor, a stepping motor, a servo motor or a linear motor.

Further, the optical detection platform includes one or more fill light lamps disposed on one side, two sides or a circumferential side of the area to be tested and irradiated to the area to be tested.

Further, the imaging device is a Line-Scan Camera or an Area-Scan Camera.

Further, the types of the linear encoder include an optical linear encoder, an electromagnetic linear encoder, and a resistive linear encoder.

Another object of the present invention is to provide an optical detection platform having the foregoing reciprocating linear encoder, comprising a conveying device and an imaging device. A vacuum suction device, and two reciprocating linear encoders. The conveying device comprises a conveyor belt having a plurality of through holes and an axle, and a first driving device for driving the conveyor belt to move in a detecting direction. The camera device is disposed on one side of the conveyor belt and is photographed in the direction of the conveyor belt to define a region to be tested on the conveyor belt. The vacuum suction device is disposed on the other side of the conveyor belt relative to the area to be tested, and the vacuum suction device has a gas guiding surface corresponding to the plurality of through holes to provide adsorption to the plurality of through holes force. The reciprocating linear encoders are respectively disposed on two sides of the conveyor belt. The reciprocating linear encoders respectively rotate the conveyor belt by the positioning mechanism to obtain the travel distance of the conveyor belt.

Further, the code strip has a plurality of position codes, and the encoder read head feeds back the position code to the operation unit to calculate the travel distance of the conveyor belt by the operation unit.

Further, the resetting device includes a fixing mechanism coupled to the slider and having a combined state and a separated state, a guide rail provided by the fixing mechanism, and a connecting mechanism fixed to the bracket to control the fixing mechanism to be displaced on the rail a second driving device, the encoder reading head returns a reset command to the computing unit when detecting that the positioning mechanism moves to the critical position, and the operating unit causes the positioning mechanism when receiving the resetting instruction The conveyor belt is released, and the fixing mechanism is coupled to the slider, and the second driving device is activated to drive the slider to return to the starting position.

Further, the second driving device is a synchronous motor, an induction motor, a reversible motor, a stepping motor, a servo motor, a linear motor, or a cylinder.

Further, the vacuum suction device comprises a vacuum chamber, a plurality of air holes disposed on one side of the vacuum chamber, and a side disposed on the vacuum chamber and providing a negative pressure to the vacuum chamber. A plurality of pores form a vacuuming unit of the gas guiding surface.

Further, the first driving device is an induction motor, a reversible motor, a stepping motor, a servo motor or a linear motor.

Further, the optical detection platform includes one or more fill light lamps disposed on one side, two sides or a circumferential side of the area to be tested and irradiated to the area to be tested.

Further, the imaging device is a Line-Scan Camera or an Area-Scan Camera.

Further, the types of the linear encoder include an optical linear encoder, an electromagnetic linear encoder, and a resistive linear encoder.

Therefore, the present invention has the following excellent effects as compared with the aforementioned prior art:

1. The present invention can accurately measure the position, the stroke distance, or the moving speed of the conveyor belt through the reciprocating linear encoder, and increase the accuracy of the image obtained when the object to be tested is photographed.

2. The present invention can read the position, stroke distance, or moving speed of the conveyor belt by two sets of reciprocating linear encoders respectively. When one set of reciprocating linear encoders performs the resetting operation, another set of reciprocating type can be used. The linear encoder continues to feed back the position of the conveyor belt, the travel distance, or the moving speed to the arithmetic unit, increasing the efficiency of the detection.

100‧‧‧ optical inspection platform

110‧‧‧Conveyor

111‧‧‧Conveyor belt

112‧‧‧First drive

113‧‧‧Axle

114‧‧‧through hole

120‧‧‧ camera

130‧‧‧Vacuum suction device

131‧‧‧vacuum chamber

132‧‧‧ stomata

133‧‧‧vacuum unit

134‧‧‧ gas guiding surface

141‧‧‧Reciprocating Linear Encoder

142‧‧‧ Slider

143‧‧‧ Track

144‧‧‧ Positioning mechanism

145‧‧‧Code strip

146‧‧‧Encoder read head

148‧‧‧Return device

1481‧‧‧Fixed institutions

1482‧‧‧Second drive

1483‧‧‧rail

150‧‧‧ fill light

S0‧‧‧Test object

IP‧‧‧Detection direction

RA‧‧‧Down area

P1‧‧‧ starting position

P2‧‧‧ critical position

210‧‧‧First reciprocating linear encoder

211‧‧‧ Slider

212‧‧‧ Positioning mechanism

213‧‧‧Encoder read head

214‧‧‧Code strip

215‧‧‧ Track

220‧‧‧Second reciprocating linear encoder

221‧‧‧ Slider

222‧‧‧ Positioning agency

223‧‧‧Encoder read head

224‧‧‧ Code strip

225‧‧‧ Track

230‧‧‧Return device

231‧‧‧Fixed institutions

232‧‧‧rails

233‧‧‧Second drive

240‧‧‧Return device

241‧‧‧Fixed institutions

242‧‧‧ Guide rail

243‧‧‧Second drive

S1‧‧‧Test object

S2‧‧‧Test object

Fig. 1 is a schematic view showing the appearance of a first embodiment of the present invention.

Figure 2 is a side elevational view of a first embodiment of the present invention.

Fig. 3 is a partially enlarged schematic view showing a first embodiment of the present invention.

4-1 to 4-3 are schematic diagrams (1), an operation diagram (2), and an operation diagram (3) of the first embodiment of the present invention.

Fig. 5 is a schematic view showing the appearance of a second embodiment of the present invention.

Figure 6 is a plan view of a second embodiment of the present invention.

7-1 to 7-3 are schematic diagrams (1), an operation diagram (2), and an operation diagram (3) of the second embodiment of the present invention.

The detailed description and technical contents of the present invention will now be described with reference to the drawings. In addition, the drawings are not intended to limit the scope of the present invention, and the proportions thereof are not intended to limit the scope of the present invention.

The invention provides a reciprocating linear encoder for measuring the travel distance of a conveyor belt and feeding back the obtained value to the arithmetic unit. The reciprocating linear encoder can be applied to an optical detection platform for precise detection of panels and sheets. When the panel and the cassette are detected in conjunction with the camera, it is ensured that each frame obtained by the camera maintains the same accuracy without distortion.

Please refer to FIG. 1 , which is a schematic diagram of the appearance of the first embodiment of the present invention, as shown in the figure:

The optical detection platform 100 of the present embodiment provides a single-sided reciprocating linear encoder 141 for feeding back the position information of the conveyor belt 111 to an arithmetic unit (not shown). The reciprocating optical detection platform 100 includes a transport device 110, an imaging device 120 disposed on one side of the transport device 110, a vacuum flat device 130 disposed on the inner side of the transport device 110, and a transport device 110 disposed on the transport device 110. The side of the conveyor belt 111 is a reciprocating linear encoder 141 that measures the position information of the conveyor belt.

The conveying device 110 includes a conveyor belt 111 having a plurality of through holes 114 (shown in FIG. 2), and a first driving device 112 that drives the conveyor belt 111 to move the object S0 toward a detecting direction IP. In a preferred embodiment, the material of the conveyor belt may be a gas permeable material. The conveyor belt 111 is wound around a plurality of axles 113 connected to the first driving device 112. When the first driving device 112 operates, the axle 113 is pivoted by the rough surface and the conveyor belt on the axle 113. The 111 pieces of traction force drive the conveyor belt 111 to move toward the detection direction IP. In the detection direction IP, the conveyor belt 111 is driven by the axle 113 to travel clockwise or counterclockwise, so that the object S0 carried on the conveyor belt 111 moves toward the camera 120. Direction of travel. The first driving device 112 can be an induction motor, a reversible motor, a stepping motor, a servo motor, a linear motor or the like, which is not limited in the present invention.

The camera device 12 is disposed on one side of the conveyor belt 111 and is photographed in the direction of the conveyor belt 111 to define a region to be tested RA on the conveyor belt 111. In the preferred embodiment, the camera device 120 is a line-scan camera that uses the moving object S0 to obtain a full-face image. In other embodiments, the camera device 120 may also be an area-scan camera (Area-Scan Camera), which is not limited in the present invention. The area to be tested RA in the present invention refers to an area in which the imaging device 120 corresponds to the detection path IP in which the image of the object S0 can be clearly captured. One side of the area to be tested RA (the upper side in this embodiment) may be provided with one or more fill light 150, and is irradiated on the area to be tested RA to be tested on the area RA to be tested. The object S0 is filled with light. In addition to the above-mentioned implementation, the fill light 150 may be disposed on the two sides of the area to be tested RA or in the area to be tested, and is not limited in the present invention.

The vacuum suction device 130 is disposed on the other side of the conveyor belt 111 opposite to the area to be tested RA to provide a vacuum adsorption force to the object S0 on the conveyor belt 111 to avoid the edge of the object S0. There is a problem of warpage. For a detailed construction of the vacuum suction device 130, please refer to FIG. 2 together. The vacuum suction device 130 has a gas guiding surface 134 corresponding to the plurality of through holes 114 for The plurality of through holes 114 provide an adsorption force. Specifically, the vacuum suction device 130 includes a vacuum chamber 131, a plurality of air holes 132 disposed on one side of the vacuum chamber 131, and a side disposed on the vacuum chamber 131 and the vacuum chamber 131. A vacuum unit 133 that provides a negative pressure is provided. When the vacuum unit 133 supplies a negative pressure to the vacuum chamber 131, the gas will enter the vacuum chamber 131 through the plurality of pores 132, and the vacuum adsorption force provided by the plurality of pores 132 will be in the vacuum chamber. The gas guiding surface 134 is formed on one side of the 131.

The reciprocating linear encoder 141 is disposed on one side of the conveyor belt 111 for clamping the conveyor belt 111 and measuring the stroke distance of the conveyor belt 111. For the detailed construction of the reciprocating linear encoder 141, please refer to "Figure 3":

The reciprocating linear encoder 141 mainly includes a code strip 145 located on one side of the conveyor belt 111, and a slider 142 disposed on a rail 143 for moving through the rail 143. A positioning mechanism 144 for holding the conveyor belt 111 on the block 142, and an encoder read head 146 fixed to the positioning mechanism 144. The code strip 145 has a plurality of position codes, and the operation unit can read the position code on the code strip 145 by the encoder read head 146 to confirm the position of the slider 142. The arithmetic unit can obtain the position code of the conveyor belt 111 through the encoder read head 146, calculate the travel distance or the moving speed by using the position code, and form corresponding control commands according to the obtained numerical result (for example, stop, move, The acceleration and deceleration are fed back to the first driving device 112 to adjust according to the actual situation. The reciprocating linear encoder 141 may be an optical linear encoder, an electromagnetic linear encoder, and a resistive linear encoder, which are not limited in the present invention.

When measuring the travel distance of the conveyor belt 111, the positioning mechanism 144 is attached to the conveyor belt 111 at a starting position P1, thereby moving through the rail 143, and along with the conveyor belt 111 to a predetermined critical position P2. After the positioning mechanism 144 moves the critical position P2 from the starting position P1, the positioning mechanism 144 leaves the conveyor belt 111 and returns to the starting position P1 through a resetting device 148.

The resetting device 148 includes a fixing mechanism 1481 coupled to the slider 142 and having two states of bonding and separating, a guiding rail 1482 for the fixing mechanism 1481, and a fastening mechanism 1481 coupled to the fixing mechanism 1481 to control the fixing. machine The second driving device 1482 is configured to be displaced on the guide rail 1482. The fixing mechanism 1481 can fix the slider 142 by mechanical means (such as clamping, snapping, limiting, etc.) or non-mechanical (such as magnetic attraction), and the second driving device 1482 can be a synchronous motor. The induction motor, the reversible motor, the stepping motor, the servo motor, the linear motor, or the cylinder are not limited in the present invention. The encoder read head 146 returns a reset command to the operation unit when detecting that the slider 142 moves to the critical position P2, and the operation unit releases the positioning mechanism 144 when receiving the reset command. The conveyor belt 111 is coupled to the slider 142 and the second driving device 1482 is activated to bring the slider 142 back to the starting position.

For the operation mode of the first embodiment of the present invention, please refer to "FIG. 4-1" to "FIG. 4-3", which is a schematic diagram of the operation of the first embodiment of the present invention, as shown in the figure:

Please refer to FIG. 4-1 first. At the beginning, the personnel or the transfer device sets the object to be tested S0 on the conveyor belt 111, and the object S0 to be tested is moved by the conveyor belt 111 to the starting position P1. When the sensor (not shown) on the side of the conveyor belt 111 senses the object S0, it transmits a trigger command to the operation unit. Upon receiving the trigger command, the arithmetic unit temporarily stops the conveyor belt 111 and starts a detection program.

For the connection, please refer to "Fig. 4-2". When the detection program is started, the positioning mechanism 144 clamps the conveyor belt 111 to move the slider 142 from the starting position P1 to the detection direction IP to a preset threshold. Position P2. While the slider 142 is moving, the encoder read head 146 transmits the read position code to the operation unit, and the operation unit acquires the slider 142 (the conveyor belt 111) by position coding. Travel distance. .

When the slider 142 is pulled by the conveyor belt 111 in the detection direction IP, the imaging device 120 disposed on the side of the conveyor belt 111 captures the object S0 and acquires the image of the object S0. The image is used for flaw detection.

Finally, please refer to FIG. 4-3. When the arithmetic unit detects that the slider 142 moves to the critical position P2, the positioning mechanism 144 is controlled to leave the conveyor belt 111. At this time, the resetting device 148 disposed on one side of the positioning mechanism 144 will move the slider 142 back to the starting position, so that the linear encoder 141 performs another detecting process on the next object S0.

Please refer to FIG. 5 and FIG. 6 , which are schematic diagrams and top views of the second embodiment of the present invention, as shown in the figure:

The main difference between this embodiment and the first embodiment is that the first embodiment of the conveyor belt 111 is provided with a first reciprocating linear encoder 210 and a second reciprocating linear encoder 220, respectively. The first reciprocating linear encoder 210 and the second reciprocating linear encoder 220 respectively operate in turn on the two sides of the conveyor belt, eliminating the need for the single reciprocating linear encoder 141 to be reset to the starting position P1. time. The following is a detailed description of the detailed construction and operation of the first reciprocating linear encoder 210 and the second reciprocating linear encoder 220, and the rest is the same as the first embodiment, and will not be further described below.

The first reciprocating linear encoder 210 mainly includes a code strip 214 located on one side of the conveyor belt 111 and disposed on a track 215. A slider 211 that moves through the rail 215, a positioning mechanism 212 that is disposed on the slider 211 for clamping the conveyor belt 111, and an encoder read head 213 that is fixed to the positioning mechanism 212.

Like the first linear encoder 210, the second reciprocating linear encoder 220 mainly includes a code strip 224 located at and parallel to the conveyor belt 111 opposite to the other side of the first reciprocating linear encoder 210. a slider 221 disposed on a rail 224 for moving through the rail 224, a positioning mechanism 222 disposed on the slider 221 for clamping the conveyor belt 111, and a code fixed to the positioning mechanism 222 Read head 223.

The computing unit sequentially controls the positioning mechanisms 212, 222 of the first reciprocating linear encoder 210 and the second reciprocating linear encoder 220 to respectively clamp or leave the conveyor belt 111 on both sides of the conveyor belt 111. Position encoding of the conveyor belt 111 is obtained by the encoder heads 213, 223 of the first reciprocating linear encoder 210 and the second reciprocating linear encoder 220, respectively, and the travel distance or movement is calculated by the position encoding. speed.

A resetting device 230 (240) is included on one side of the first reciprocating linear encoder 210 and the second reciprocating linear encoder 220, respectively. The resetting device 230 (240) includes a fixing mechanism 231 (241) coupled to the slider 211 (221) and having two states of bonding and separating, and a guiding rail 232 for the fixing mechanism 231 (241) ( 242), and a second driving device 233 (243) coupled to the fixing mechanism 231 (241) to control the fixing mechanism 231 (241) to be displaced on the rail 232 (242). The fixing mechanism 231 (241) is mechanically movable (for example, clamping, snapping, The slider 211 (221) is fixed in a manner such as a limit or the like, and the second driving device 233 (243) may be a synchronous motor, an induction motor, a reversible motor, a stepping motor, or a servo. The motor, the linear motor, or the cylinder is not limited in the present invention. The encoder read head 213 (223) returns a reset command to the operation unit when detecting that the slider 211 (221) moves to the critical position P2, and the operation unit makes the reset instruction The positioning mechanism 212 (222) releases the conveyor belt 111, and the fixing mechanism 231 (241) is coupled to the slider 211 (221), and the second driving device 233 (243) is activated to drive the slider 211 ( 221) Return to the starting position.

For the operation mode of the second embodiment of the present invention, please refer to "FIG. 7-1" to "FIG. 7-4", which is a schematic diagram of the operation of the second embodiment of the present invention, as shown in the figure:

Please refer to "FIG. 7-1". At the beginning, the personnel or the transfer device places the object to be tested S1 on the conveyor belt 110, and the object S1 is moved to the start by the conveyor belt 111. In the position, the sensor senses the object S1 on the side of the conveyor belt 111, and transmits a trigger command to the operation unit. When the motion unit receives the trigger command, the first detection program is started. .

For the connection, please refer to "Fig. 7-2". When the detection program is started, the arithmetic unit first activates the first reciprocating linear encoder 210 on one side. The positioning mechanism 212 of the first reciprocating linear encoder 210 clamps the conveyor belt 111 to move the slider 211 from the starting position P1 toward the detecting direction IP to a preset critical position P2. While the slider 211 is moving, the encoder read head 213 of the first reciprocating linear encoder 210 transmits the read position code to the operation unit, and the operation is performed. The unit obtains the stroke distance of the slider 211 (conveyor belt 111) by position coding. When the slider 211 is pulled by the conveyor belt 111 in the detection direction IP, the imaging device 120 disposed on the side of the conveyor belt 111 captures the object S1 and acquires the image of the object S1. The image is used for flaw detection.

While the slider 211 of the first reciprocating linear encoder 210 is moved to the critical position P2, the person or the transfer arm places the next group of objects S2 on the conveyor belt 111. When the object to be tested S2 is moved to the starting position P1 by the conveyor belt 111, the sensor system senses the object to be tested S2 on the side of the conveyor belt 111, and transmits a trigger command to the operation unit. When the motion unit receives the trigger command, it initiates a second detection procedure.

For the connection, please refer to FIG. 7-3. When the operation unit detects that the slider 211 of the first reciprocating linear encoder 210 moves to the critical position P2, the positioning mechanism 212 of the first linear encoder 210 The conveyor belt 111 is released. At this time, the resetting device 230 disposed on the side of the positioning mechanism 212 drives the slider 211 to move back to the starting position. At the same time, the positioning mechanism 222 of the second linear encoder 220 clamps the conveyor belt 111, and moves the slider 221 from the starting position P1 toward the detecting direction IP to a preset critical position P2. The imaging device 12 performs another detection and is performed in turn by the above-described operation sequence.

In summary, the present invention can accurately measure the position, stroke distance, or moving speed of the conveyor belt through the reciprocating linear encoder, and increase the accuracy of the image obtained when the object to be tested is photographed. In addition, the present invention can sequentially read the position, the travel distance, or the moving speed of the conveyor belt by two sets of reciprocating linear encoders. When a set of reciprocating linear encoders performs a reset operation, the position, stroke distance, or moving speed of the conveyor belt can be continuously fed back to the arithmetic unit by another set of reciprocating linear encoders, thereby increasing the efficiency of detection.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Variations and modifications are still within the scope of the patents of the present invention.

100‧‧‧ optical inspection platform

110‧‧‧Conveyor

111‧‧‧Conveyor belt

112‧‧‧First drive

113‧‧‧Axle

120‧‧‧ camera

130‧‧‧Vacuum suction device

141‧‧‧Reciprocating Linear Encoder

142‧‧‧ Slider

143‧‧‧ Track

144‧‧‧ Positioning mechanism

145‧‧‧Code strip

146‧‧‧Encoder read head

1481‧‧‧Fixed institutions

1482‧‧‧Second drive

1483‧‧‧rail

150‧‧‧ fill light

S0‧‧‧Test object

RA‧‧‧Down area

Claims (20)

A reciprocating linear encoder for measuring a stroke distance of a conveyor belt, the linear encoder comprising: a code strip located on one side of the conveyor belt; and a slider disposed on a track The positioning mechanism is disposed on the slider for clamping the conveyor belt; an encoder reading head is fixed on the positioning mechanism; wherein when the stroke distance is equivalently measured, the positioning mechanism is together a starting position attached to the conveyor belt for moving through the track, and with the conveyor belt to a predetermined critical position, the positioning mechanism leaves the conveyor belt after the positioning mechanism moves the critical position from the starting position And return to the starting position through a reset device. The linear encoder of claim 1, wherein the linear encoder comprises an optical linear encoder, an electromagnetic linear encoder, and a resistive linear encoder. An optical detection platform having the reciprocating linear encoder according to claim 1, comprising: a conveying device comprising a conveying belt having a plurality of through holes and an axle, and driving the conveyor belt to move toward a detecting direction a first driving device; an imaging device disposed on one side of the conveyor belt and facing the conveyor belt Shooting, on the conveyor belt defining a region to be tested; a vacuum suction device is disposed on the other side of the conveyor belt relative to the area to be tested, the vacuum suction device has a corresponding to the plurality of passes a gas guiding surface of the hole to provide an adsorption force to the plurality of through holes; and a reciprocating linear encoder as described in claim 1, disposed on one side of the conveyor belt, the reciprocating linear encoder The conveyor belt is clamped by the positioning mechanism to obtain the travel distance of the conveyor belt. The optical detection platform of claim 3, wherein the code strip has a plurality of position codes, and the encoder read head feeds back the position code to the operation unit to calculate the operation unit by the operation unit The travel distance of the conveyor belt. The optical detection platform of claim 4, wherein the resetting device comprises a fixing mechanism coupled to the slider and having a combined state and a separated state, a guide rail provided by the fixing mechanism, and a joint The fixing mechanism is configured to control the second driving device of the fixing mechanism to be displaced on the rail, and the encoder reading head returns a reset command to the computing unit when detecting that the positioning mechanism moves to the critical position, the operation When receiving the reset command, the unit causes the positioning mechanism to release the conveyor belt, and the fixing mechanism is coupled to the slider, and activates the second driving device to drive the slider to return to the starting position. The optical detection platform of claim 5, wherein the second driving device is a synchronous motor, an induction motor, a reversible motor, a stepping motor, and a servo Motor, linear motor, or cylinder. The optical inspection platform of claim 3, wherein the vacuum suction device comprises a vacuum chamber, a plurality of air holes disposed on one side of the vacuum chamber, and a side disposed on the vacuum chamber And supplying a vacuum to the vacuum chamber to form a vacuuming unit of the gas guiding surface by the plurality of pores. The optical detection platform of claim 3, wherein the first driving device is an induction motor, a reversible motor, a stepping motor, a servo motor or a linear motor. The optical inspection platform of claim 3, further comprising one or more fill lamps disposed on one side, two sides or a circumference side of the area to be tested and irradiated to the area to be tested. The optical detection platform according to claim 3, wherein the imaging device is a Line-Scan Camera or an Area-Scan Camera. The optical inspection platform of claim 3, wherein the linear encoder comprises an optical linear encoder, an electromagnetic linear encoder, and a resistive linear encoder. Optical device having a reciprocating linear encoder as described in claim 1 The detecting platform comprises: a conveying device comprising: a conveying belt having a plurality of through holes and an axle, and a first driving device for driving the conveyor belt to move in a detecting direction; and an image capturing device disposed on the conveyor belt One side, and photographing in the direction of the conveyor belt to define a region to be tested on the conveyor belt; a vacuum suction device is disposed on the other side of the conveyor belt relative to the area to be tested, the vacuum suction device And a gas guiding surface corresponding to the plurality of through holes to provide an adsorption force to the plurality of through holes; and a reciprocating linear encoder according to claim 1 of the patent scope, respectively disposed on the conveyor belt On both sides, the reciprocating linear encoder respectively rotates the conveyor belt by the positioning mechanism to obtain the travel distance of the conveyor belt. The optical inspection platform of claim 12, wherein the code strip has a plurality of position codes, and the encoder read head feeds back the position code to the operation unit to calculate the conveyance by the operation unit. The travel distance of the belt. The optical detection platform of claim 13, wherein the resetting device comprises a fixing mechanism coupled to the slider and having a combined state and a separated state, a guide rail provided by the fixing mechanism, and a joint The fixing mechanism is configured to control the second driving device of the fixing mechanism to be displaced on the rail, and the encoder reading head returns a reset command to the computing unit when detecting that the positioning mechanism moves to the critical position, the operation Receiving the reset command, the unit causes the positioning mechanism to release the conveyor belt, and the fixing mechanism is coupled to the slider, and The second driving device is activated to drive the slider to return to the starting position. The optical detection platform of claim 14, wherein the second driving device is a synchronous motor, an induction motor, a reversible motor, a stepping motor, a servo motor, a linear motor, or a cylinder. The optical inspection platform of claim 12, wherein the vacuum suction device comprises a vacuum chamber, a plurality of air holes disposed on one side of the vacuum chamber, and a side disposed on the vacuum chamber And supplying a vacuum to the vacuum chamber to form a vacuuming unit of the gas guiding surface by the plurality of pores. The optical detection platform of claim 12, wherein the first driving device is an induction motor, a reversible motor, a stepping motor, a servo motor or a linear motor. The optical detection platform of claim 12, further comprising one or more fill lamps disposed on one side, two sides or a circumferential side of the area to be tested and irradiated to the area to be tested. The optical detection platform according to claim 12, wherein the imaging device is a Line-Scan Camera or an Area-Scan Camera. The optical inspection platform of claim 12, wherein the linear encoder comprises an optical linear encoder, an electromagnetic linear encoder, and an electric Resistive linear encoder.