CN102466842B - Optical device and lens collision prevention method thereof - Google Patents

Abstract

The invention relates to an optical device and a lens collision prevention method. The lens includes a metal lens barrel. The driving unit is connected with and moves the lens. The control unit is electrically connected with the driving unit to control the movement of the lens. The frame is provided with an inner wall and defines the moving range of the lens. The boundary sensing unit is arranged on the inner wall and comprises an integrated circuit and a plurality of sensing components. The integrated circuit is electrically connected with the control unit. The sensing component is electrically connected with the integrated circuit. The sensing components are equidistantly arranged on the inner wall and surround the lens, wherein when the metal lens barrel approaches any sensing component, the capacitance of the sensing component is changed, the integrated circuit sends a position sensing signal to the control unit according to the capacitance change of the sensing component, and the control unit controls the lens to move according to the position sensing signal.

Description

Optical device and lens collision prevention method thereof

technical field

The invention relates to an optical device, in particular to an optical device with the function of preventing lens collision and a method for preventing lens collision.

Background technique

The existing optical device is disclosed in Taiwan Patent Publication No. 200905354. In existing optical devices, in order to prevent the lens from colliding with the frame, the control unit generally calculates the number of steps of the stepping motor to determine the position coordinates of the lens, and then compares the position coordinates with the critical coordinates in the database. Yes, to determine whether a collision will occur. However, in the prior art, the overall cost of the optical device is increased due to the high cost of devices such as stepping motors, control units, and database memory. In addition, due to the complicated calculation steps, in order to avoid inertial collisions, it is necessary to reduce the moving speed of the lens, causing inconvenience to users.

Contents of the invention

The technical problem to be solved by the present invention is to provide an optical device and a lens collision prevention method thereof, which can achieve the purpose of preventing collision at low cost, aiming at the defect of relatively high cost of related components of the optical device in the prior art.

The technical solution adopted by the present invention to solve the technical problem is to provide an optical device including a lens, a driving unit, a control unit, a frame and a boundary sensing unit. The lens includes a metal barrel. A drive unit connects and moves the lens. The control unit is electrically connected to the driving unit to control the movement of the lens. The bezel has inner walls that define the range of lens movement. The boundary sensing unit is disposed on the inner wall and includes an integrated circuit and a plurality of sensing components. The integrated circuit is electrically connected to the control unit. The sensing component is electrically connected to the integrated circuit. These sensing components are equidistantly arranged on the inner wall and surround the lens, wherein, when the metal lens barrel is close to any sensing component, the capacitance of the sensing component changes, and the integrated circuit according to the capacitance of the sensing component The volume change sends a position sensing signal to the control unit, and the control unit controls the movement of the lens according to the position sensing signal.

The present invention also provides a lens collision prevention method, comprising:

providing an optical device as described above;

The control unit compares the position sensing signal with a position critical value, and when the position sensing signal reaches the position critical value, the control unit limits the action of the driving unit.

With the application of the present invention, due to the simple control steps and simple operation principle, the purpose of preventing collision can be achieved at low cost.

Description of drawings

1 is a perspective view showing an optical device of an embodiment of the present invention;

2 is a block diagram showing an optical device of an embodiment of the present invention;

Fig. 3 shows the detailed structure of the boundary sensing unit; and

FIG. 4 shows the orientation of the sensor assembly.

Detailed ways

FIG. 1 is a perspective view showing an optical device 100 according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the optical device 100 according to an embodiment of the present invention. Referring to FIGS. 1 and 2 , an optical device 100 according to an embodiment of the present invention includes a lens 110 , a driving unit 120 , a control unit 130 , a frame 140 and a boundary sensing unit 150 . The lens 110 includes a metal lens barrel 111 . The driving unit 120 connects and moves the lens 110 . The control unit 130 is electrically connected to the driving unit 120 to control the movement of the lens 110 . The bezel has inner walls 141, the bezel 140 defining the range of lens movement. The boundary sensing unit 150 is disposed on the inner wall 141 .

Referring to FIGS. 1 and 3 together, FIG. 3 shows a detailed structure of the boundary sensing unit 150 . The boundary sensing unit 150 includes an integrated circuit 151 , a flexible circuit board 152 and a plurality of sensing components 153 . The integrated circuit 151 is electrically connected to the control unit 130 . The sensing component 153 is electrically connected to the integrated circuit 151 through the flexible circuit board 152 . The sensing components 153 are equidistantly disposed on the flexible circuit board 152 . These sensing components 153 may be copper foils. The integrated circuit 151 is a capacitive sensing integrated circuit.

Referring to FIGS. 1 and 4 , in an embodiment of the present invention, the sensing components 153 surround the lens 110 equidistantly, and the flexible circuit board 152 is disposed on the inner wall 141 . The number of these sensing components 153 is eight, and they are equidistantly arranged with an angle difference of 45°. Wherein, when the metal lens barrel 111 is close to any of the sensing components 153 , the charge on the sensing component 153 is attracted, causing the capacitance to change. The integrated circuit 151 sends a position sensing signal to the control unit 130 according to the capacitance change of the sensing component 153 , and the control unit 130 controls the movement of the lens 110 according to the position sensing signal. Accordingly, the moving direction of the lens 110 can be accurately detected. In other embodiments, the number of these sensing components can vary as needed, for example, the number of these sensing components can be four.

In the embodiment of the present invention, the frame is circular, and in other embodiments, the frame can also be in other shapes, for example, square.

In the above embodiment, the control unit 130 compares the position sensing signal with the position threshold value, when the lens 110 is too close to the inner wall 141, the position sensing signal reaches the position threshold value, and the control unit 130 thus limits the driving Action of the unit 120 to prevent the lens 110 from colliding with the frame 140 .

With the application of the present invention, due to the simple control steps and simple operation principle, the purpose of preventing collision can be achieved at low cost.

Although the present invention has been disclosed above with specific preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can still make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (10)

1. Optical devices is characterized in that, comprising:

Camera lens comprises the metal lens barrel;

Driver element connects and mobile this camera lens;

Control unit is electrically connected this driver element, to control the movement of this camera lens;

Frame has inwall, this frame definition lens moving scope; And

The border sensing cell is located at this inwall, comprising:

Integrated circuit is electrically connected this control unit; And

A plurality of sensing components, be electrically connected this integrated circuit, these sensing components equidistantly are located at this inwall and around this camera lens, wherein, when nearly this arbitrary sensing component of this speculum socket joint, the capacitance of this sensing component changes, and this integrated circuit sends the location sensing signal according to the electric capacitance change of this sensing component towards this control unit, and this control unit is according to the movement of this this camera lens of location sensing signal controlling.

2. Optical devices as claimed in claim 1 is characterized in that, these sensing components are Copper Foil.

3. Optical devices as claimed in claim 1 is characterized in that, this integrated circuit is the capacitance type sensing integrated circuit.

4. Optical devices as claimed in claim 1 is characterized in that, this border sensing cell more comprises flexible circuit board, and these sensing components are equidistantly to be arranged on the flexible circuit board, and are electrically connected this integrated circuit by this flexible circuit board.

5. Optical devices as claimed in claim 4 is characterized in that, this flexible circuit board is located at this inwall.

6. a collision prevention method of lens is characterized in that, comprising:

Optical devices such as claim 1 are provided;

This control unit is this location sensing signal fusing one position critical value, and when this location sensing signal reached this position critical value, this control unit limited the action of this driver element.

7. collision prevention method of lens as claimed in claim 6 is characterized in that, these sensing components are Copper Foil.

8. collision prevention method of lens as claimed in claim 6 is characterized in that, this integrated circuit is the capacitance type sensing integrated circuit.

9. collision prevention method of lens as claimed in claim 6 is characterized in that, this border sensing cell more comprises flexible circuit board, and these sensing components are equidistantly to be arranged on the flexible circuit board, and are electrically connected this integrated circuit by this flexible circuit board.

10. collision prevention method of lens as claimed in claim 9 is characterized in that, this flexible circuit board is located at this inwall.

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