CN218332128U - Focusing stroke control device and focusing stroke control circuit - Google Patents
Focusing stroke control device and focusing stroke control circuit Download PDFInfo
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- CN218332128U CN218332128U CN202222625045.0U CN202222625045U CN218332128U CN 218332128 U CN218332128 U CN 218332128U CN 202222625045 U CN202222625045 U CN 202222625045U CN 218332128 U CN218332128 U CN 218332128U
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Abstract
The utility model provides a focusing stroke controlling means and focusing stroke controlling circuit, wherein this focusing stroke controlling means includes the moving body, direct current motor, first control circuit and second control circuit, wherein this moving body is set up the focusing lens group that is used for driving zoom and removes, this direct current motor is used for driving this moving body and removes between the first stroke end of camera lens and second stroke end, wherein this direct current motor, this first control circuit and this second control circuit are established ties mutually, wherein this first control circuit includes a first limit switch, a first diode and a first electric capacity, this second control circuit includes a second limit switch, a second diode and a second electric capacity, wherein this first limit switch of this first control circuit, this first diode and this first electric capacity are parallelly connected, this second limit switch of this second control circuit, this second diode and this second electric capacity are parallelly connected.
Description
Technical Field
The utility model relates to a focusing stroke controlling means especially relates to a focusing stroke controlling means at high low temperature environment homoenergetic accurate control focusing stroke. The utility model discloses further relate to a focusing stroke control circuit for focusing stroke controlling means.
Background
Focusing stroke control devices for focusing (or zooming) lenses are increasingly widely used due to their unique advantages. Generally, a zoom lens is focused using a Direct Current (DC) motor, and is provided with a driving circuit for controlling the movement of the DC motor.
The focusing path of the existing zoom lens has corresponding stroke limitation. When a user focuses, the zoom lens needs to ensure that the moving body moves to the stroke end, and can stably stay at the preset stroke end, namely, the moving body does not exceed the stroke end and continue to move, and does not return to be far away from the stroke end. In the focusing process, the motor drives the moving body to move, the stopper with the elastic sheet is arranged at the stroke limit position to prevent the moving body from continuously moving, when the moving body generally collides with the elastic sheet, the limit switch is triggered, the circuit is cut off, the torque of the motor returns to zero, the motor stops working, and under the action of friction and elasticity, the moving body pushes the elastic sheet to do deceleration motion and finally stops at the stopper. However, under extreme temperature conditions, such as high temperature conditions, the lubricating oil becomes diluted, the friction force of the moving body during moving becomes small, when the moving body impacts the stopper, the speed is higher than that under normal temperature, the force impacting the stopper becomes large, the resilience force becomes large, once the rebound displacement exceeds the stroke of the elastic sheet, the current in the circuit is recovered, the motor continues to drive the moving body to move towards the stopper, and then rebounds again, and the cycle is repeated, so that the drive control program cannot return to zero and can not be initialized, meanwhile, the abrasion of the moving body, the elastic sheet and the stopper is increased, and the power consumption of the motor is increased; when the motor drives the moving body to move reversely, the lubricating oil is more viscous, the friction force is larger, the moving body moves slowly or stops, and the power consumption of the motor is increased.
US patent publication No. US6118242A discloses a stroke limiting circuit for a zoom/focus lens or an actuator for driving a diaphragm, which includes a motor, a stopper, and a control circuit including two diodes connected in parallel, wherein when a positive voltage is applied to an a end of the stroke limiting circuit, the motor rotates to drive a focus lens group to move in a telephoto direction, when the focus lens group moves to a distal end of a stroke, a current flow supplied to the motor is reversed to eliminate inertial rotation of the motor, the motor stops rotating, a load is applied even to a stop position, and then the motor stops rotating, and an impact strength of the focus lens group to a stopper 23 becomes small to prevent the focus lens group from being rebounded. However, the control circuit of the stroke limiting circuit of the zoom/focus lens or the actuator driving the diaphragm disclosed in this patent does not ensure that the focus lens group does not bounce and continue striking under extreme temperature conditions, especially under high temperature conditions.
SUMMERY OF THE UTILITY MODEL
The utility model has the main advantage of providing a focusing stroke controlling means, it is even under higher temperature, also can ensure that the mobile body is moved by the drive and is strikeed when keeping off the piece, stably stops keeping off piece department at the stroke end, and does not take place bounce-back and continuous striking.
Another advantage of the present invention is to provide a focusing stroke control device, which can effectively improve the driving capability of the entire focusing stroke control device when the temperature is low.
Another advantage of the present invention is to provide a focusing stroke control circuit, which can keep the driving motor rotating for a proper time when the moving body moves to the stopper at a higher temperature, so as to counteract the resilience force applied to the moving body, and ensure that the moving body stably stops at the stopper at the end of the stroke and does not bounce; and when the temperature is lower, the driving capability of the whole focusing stroke control device can be effectively improved.
Other advantages and features of the present invention will become more fully apparent from the following detailed description.
Correspondingly, according to the utility model discloses, have above-mentioned advantage the utility model discloses focusing stroke control device includes:
a moving body configured to drive a focusing lens group of the zoom lens to move;
the direct current motor is used for driving the moving body to move between a first stroke end and a second stroke end of the lens;
a first control circuit; and
the second control circuit, wherein the direct current motor, the first control circuit and the second control circuit are connected in series, wherein the first control circuit comprises a first limit switch, a first diode and a first capacitor, the second control circuit comprises a second limit switch, a second diode and a second capacitor, wherein the first limit switch, the first diode and the first capacitor of the first control circuit are connected in parallel, and the second limit switch, the second diode and the second capacitor of the second control circuit are connected in parallel.
According to the embodiment of the utility model, the utility model discloses further provide a focusing stroke control circuit, it includes:
a first control circuit; and
a second control circuit, wherein the first control circuit and the second control circuit are configured and adapted to be connected in series, wherein the first control circuit comprises a first limit switch, a first diode and a first capacitor, the second control circuit comprises a second limit switch, a second diode and a second capacitor, wherein the first limit switch, the first diode and the first capacitor of the first control circuit are connected in parallel, and the second limit switch, the second diode and the second capacitor of the second control circuit are connected in parallel.
The above and other advantages of the invention will be more fully apparent from the following description and drawings.
The above and other advantages and features of the invention will be more fully apparent from the following detailed description of the invention and the accompanying drawings.
Drawings
Fig. 1 shows an exemplary zoom lens to which the focus stroke control device of the present invention is applied.
Fig. 2 is a schematic diagram of the movement of the dc motor-driven focusing lens group of the exemplary zoom lens of the focusing stroke control device according to the present invention.
Fig. 3 is the above-mentioned structural schematic diagram according to the embodiment of the present invention, wherein the first limit switch and the second limit switch of the focusing stroke control device of the present invention are both in the closed state.
Fig. 4A is the above-mentioned structural schematic diagram according to the embodiment of the present invention, wherein the first limit switch of the focusing stroke control device of the present invention is in the off state, and the second limit switch is in the on state.
Fig. 4B is the above-mentioned equivalent diagram of the control circuit when the moving body of the focusing stroke control device according to the embodiment of the present invention moves to the stroke end, wherein the first limit switch of the focusing stroke control device of the present invention is in the off state, and the second limit switch is in the on state.
Fig. 4C is the above-mentioned equivalent diagram according to the control circuit in the twinkling of an eye that the dc motor of focusing stroke controlling means reverses, wherein the utility model discloses focusing stroke controlling means's moving body removes to first stroke end, and the positive negative pole of its power takes place instantaneous switching.
Fig. 5A is the above-mentioned structural schematic diagram according to the embodiment of the present invention, wherein the first limit switch of the focusing stroke control device of the present invention is in the closed state, and the second limit switch is in the open state.
Fig. 5B is the above-mentioned movable body according to the embodiment of the present invention, when the movable body of the focusing stroke control device moves to the stroke end, the equivalent diagram of the control circuit, wherein the first limit switch of the focusing stroke control device is in the closed state, and the second limit switch is in the open state.
Fig. 5C is the above-mentioned equivalent diagram according to the control circuit in the twinkling of an eye that turns over of dc motor of the utility model discloses focusing stroke control device's moving body removes to the second stroke end, and the positive negative pole of its power takes place instantaneous switching.
Detailed Description
The following description is provided to enable any person skilled in the art to practice the invention. Other obvious substitutions, modifications and variations will occur to those skilled in the art. Accordingly, the scope of protection of the present invention should not be limited by the exemplary embodiments described herein.
It will be understood by those of ordinary skill in the art that, unless specifically indicated herein, the terms "a" and "an" should be interpreted as meaning "at least one" or "one or more," i.e., one element may be present in one embodiment and another element may be present in multiple embodiments.
It will be understood by those of ordinary skill in the art that unless otherwise indicated herein, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic sense to describe the invention as it relates to any specific device or element in a specific direction or position. Accordingly, the above terms should not be construed as limiting the present invention.
Referring to fig. 1 to 5C of the drawings of the specification, a focusing stroke control device according to an embodiment of the present invention is illustrated, which includes a moving body 11, a dc motor 12, a first control circuit 21 and a second control circuit 22, wherein the moving body 11 is configured to drive a focusing lens group L2 of a zoom lens 10 to move, the dc motor 12 is configured to drive the moving body 11 to move between a first stroke end and a second stroke end of the zoom lens 10, wherein the dc motor 12, the first control circuit 21 and the second control circuit 22 are connected in series, wherein the first control circuit 21 includes a first limit switch 211, a first diode D1 and a first capacitor C1, the second control circuit 22 includes a second limit switch 221, a second diode D2 and a second capacitor C2, wherein the first limit switch 211, the first diode D1 and the first capacitor C1 of the first control circuit 21 are connected in parallel, and the second limit switch 221, the second diode D2 and the second capacitor C2 of the second control circuit 22 are connected in parallel. It can be understood that the focusing lens group L2 of the zoom lens 10 according to the embodiment of the present invention includes at least one focusing lens. Preferably, the first limit switch 211 is disposed adjacent the first end of travel and the second limit switch 221 is disposed adjacent the second end of travel. Illustratively, the first stroke end may be formed at a position of one lens (illustratively, lens L1) adjacent to the telephoto end and the wide-angle end of the zoom lens, and the second stroke end may be formed at a position of the other lens (illustratively, lens L3) adjacent to the telephoto end and the wide-angle end of the zoom lens. Preferably, the moving body 11 is configured to drive the focus lens group L2 to move between the first stroke end and the second stroke end. Alternatively, the moving body 11 includes a focus lens group L2. Illustratively, as shown in fig. 3 of the drawings, when a voltage (12V) provided by a power supply is applied to the dc motor 12 to drive the moving body 11 to move close to the first stroke end and not to the first stroke end, the first limit switch 211 and the second limit switch 221 are in a closed state, the moving body 11 is driven to move smoothly between the first stroke end and the second stroke end, and at this time, a current flows to the first limit switch 211 and the second limit switch 221 in sequence through the dc motor 12, and the rotation direction of the dc motor 12 is a "forward direction"; alternatively, when the voltage (12V) provided by the power source is applied to the dc motor 12 to drive the moving body 11 to move close to the first stroke end and not to move to the first stroke end, the first limit switch 211 and the second limit switch 221 are in a closed state, the moving body 11 is driven to move smoothly between the first stroke end and the second stroke end, and at this time, the current flows to the second limit switch 221 and the first limit switch 211 in sequence through the dc motor 12, and the rotation direction of the dc motor 12 is "reverse".
As shown in fig. 1 to 5C of the drawings, the focusing stroke control device according to the embodiment of the present invention further includes a first stopper 31 and a second stopper 32, wherein the first stopper 31 forms the first stroke end, and the second stopper 32 forms the second stroke end, wherein the first stopper 31 is configured to generate a reverse acting force (or a resilient force) when being impacted by the moving body 11, and the second stopper 32 is configured to generate a reverse acting force (or a resilient force) when being impacted by the moving body 11. Further, the first stopper 31 is provided to actuate the first limit switch 211 to be turned off when being hit by the moving body 11, and the second stopper 32 is provided to actuate the second limit switch 221 to be turned off when being hit by the moving body 11. Preferably, the first stopper 31 has a first elastic sheet, the second stopper 32 has a second elastic sheet, and when the first stopper 31 is impacted by the moving body 11, the first elastic sheet of the first stopper 31 deforms to actuate the first limit switch 211 to be turned off; when the second stopper 32 is impacted by the moving body 11, the second elastic sheet of the second stopper 32 deforms to actuate the second limit switch 221 to be turned off.
As shown in fig. 4A and 4B of the drawings, correspondingly, the first control circuit 21 of the focusing stroke control device according to the embodiment of the present invention is configured to switch off the first limit switch 211 when the moving body 11 is driven to move to the end of the first stroke, so as to enable the current to flow from the dc motor 12 to the first capacitor C1 and the second limit switch 221 in sequence, so as to maintain the dc motor 12 to keep rotating in the "forward" direction, so as to counteract the resilience of the moving body 11 hitting the first stopper 31. The utility model discloses this first control circuit 21 of focusing stroke controlling means makes it even under the higher environment of temperature, and lubricating oil lubrication improves, leads to under the too fast condition of this moving body 11 rate of motion, also can avoid this moving body 11 to strike this first fender piece 31 back, takes place to kick-back, and makes whole focusing stroke controlling means's drive control procedure normally return to zero and accomplish the initialization. As will be understood by those skilled in the art, when the first capacitor C1 of the first control circuit 21 of the focusing stroke control device of the present invention is fully charged (charged), the voltage at both ends of the dc motor 12 is zero, and the dc motor 12 stops rotating. Accordingly, according to the present invention, the first control circuit 21 of the focusing stroke control device enables the moving body 11 to avoid rebounding and stably stop at the first stroke end even when moving to the first stroke end (impacting the first stopper 31) at a higher temperature. In addition, as shown in fig. 4C of the drawings, when the positive and negative poles of the power supply are switched and the first limit switch 211 is still turned off, the current flows from the second limit switch 221 and the first diode D1 to the dc motor 12, and the voltage across the dc motor 12 will increase instantaneously (exemplarily, as high as 24V) because the first capacitor C1 is fully charged, so that the problem of increased friction force caused by thickening of the lubricant due to too low temperature can be better solved by the dc motor 12, and the abnormal phenomenon that the moving body 11 moves slowly at low temperature or even stops can be avoided.
As shown in fig. 5A and 5B of the drawings, correspondingly, the second control circuit 22 of the focusing stroke control device according to the embodiment of the present invention is configured to switch off the second limit switch 221 when the moving body 11 is driven to move to the end of the second stroke, so as to enable the current to flow from the dc motor 12 to the second capacitor C2 and the first limit switch 211 in sequence, so as to maintain the dc motor 12 to keep rotating in the "reverse direction", and counteract the resilience of the moving body 11 hitting the second stopper 31. The utility model discloses even this second control circuit 22 of focusing stroke controlling means makes it under the higher environment of temperature, also can avoid this moving body 11 to strike this second and keep off the piece 32 after, take place to kick-back, and make whole focusing stroke controlling means's drive control procedure normally return to zero and accomplish the initialization. It can be known to those skilled in the art that when the second capacitor C2 of the second control circuit 22 of the focusing stroke control device of the present invention is fully charged (electrified), the voltage at both ends of the dc motor 12 is zero, and the dc motor 12 stops rotating. Accordingly, according to the second control circuit 22 of the focusing stroke control device of the embodiment of the present invention, the moving body 11 can avoid rebounding and stably stop at the second stroke end even when moving to the second stroke end (impacting the second stopper 32) at a higher temperature. In addition, as shown in fig. 5C of the accompanying drawings, when the positive and negative poles of the power supply are switched and the second limit switch 221 is still turned off, the current flows from the dc motor 12 and the first limit switch 211 to the second diode D, and when the positive and negative poles of the voltage applied to the dc motor 12 are switched, since the second capacitor C2 is fully charged, the voltage at the two ends of the dc motor 12 will increase, so that the dc motor 12 can better overcome the problem that the friction force is increased due to the viscosity of the lubricating oil caused by too low temperature, and avoid the abnormal phenomenon that the moving body 11 moves slowly at low temperature and even stays still.
As shown in fig. 1 to 5C of the drawings, according to the embodiment of the present invention, the present invention further provides a focusing stroke control circuit, which includes a first control circuit 21 and a second control circuit 22, wherein the first control circuit 21 and the second control circuit 22 are configured to be connected in series, wherein the first control circuit 21 includes a first limit switch 211, a first diode D1 and a first capacitor C1, the second control circuit includes a second limit switch 221, a second diode D2 and a second capacitor C2, wherein the first limit switch 211, the first diode D1 and the first capacitor C1 of the first control circuit 21 are connected in parallel, and the second limit switch 221, the second diode D2 and the second capacitor C2 of the second control circuit 22 are connected in parallel.
It is to be understood by one of ordinary skill in the art that the embodiments described above and shown in the drawings are for purposes of illustration only and are not intended to be limiting. All equivalent implementations, modifications and improvements that are within the spirit of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A focus stroke control device characterized by comprising:
a moving body configured to drive a focus lens group of the zoom lens to move;
the direct current motor is used for driving the moving body to move between a first stroke end and a second stroke end of the lens;
a first control circuit; and
the second control circuit, wherein the direct current motor, the first control circuit and the second control circuit are connected in series, wherein the first control circuit comprises a first limit switch, a first diode and a first capacitor, the second control circuit comprises a second limit switch, a second diode and a second capacitor, wherein the first limit switch, the first diode and the first capacitor of the first control circuit are connected in parallel, and the second limit switch, the second diode and the second capacitor of the second control circuit are connected in parallel.
2. The focus stroke control device of claim 1, further comprising a first stop and a second stop, wherein the first stop forms the first end of stroke and the second stop forms the second end of stroke, wherein the first stop is configured to generate a counter-force when impacted by the moving body and the second stop is configured to generate a counter-force when impacted by the moving body.
3. The focusing stroke control device according to claim 2, wherein the first stopper is provided so as to actuate the first limit switch to be turned off when struck by the moving body, and the second stopper is provided so as to actuate the second limit switch to be turned off when struck by the moving body.
4. The focusing stroke control device according to claim 3, wherein the first stopper has a first resilient piece, the second stopper has a second resilient piece, and when the first stopper is impacted by the moving body, the first resilient piece of the first stopper deforms to actuate the first limit switch to be turned off; when the second stopper is impacted by the moving body, the second elastic sheet of the second stopper deforms to actuate the second limit switch to be switched off.
5. The focus stroke control apparatus of claim 1, wherein the first limit switch is disposed proximate the first end of stroke and the second limit switch is disposed proximate the second end of stroke.
6. The focus stroke control apparatus of claim 4, wherein the first limit switch is disposed adjacent the first end of stroke and the second limit switch is disposed adjacent the second end of stroke.
7. The focus stroke control apparatus of claim 1, wherein the moving body is configured to drive the focus lens group to move between the first stroke end and the second stroke end.
8. The focus stroke control apparatus of claim 6, wherein the moving body is configured to drive the focus lens group to move between the first stroke end and the second stroke end.
9. The focus stroke control apparatus according to claim 1, 2, 3, 4, 5 or 6, wherein the moving body includes a focus lens group.
10. A focus stroke control circuit, comprising:
a first control circuit; and
a second control circuit, wherein the first control circuit and the second control circuit are configured and adapted to be connected in series, wherein the first control circuit comprises a first limit switch, a first diode and a first capacitor, the second control circuit comprises a second limit switch, a second diode and a second capacitor, wherein the first limit switch, the first diode and the first capacitor of the first control circuit are connected in parallel, and the second limit switch, the second diode and the second capacitor of the second control circuit are connected in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222625045.0U CN218332128U (en) | 2022-09-28 | 2022-09-28 | Focusing stroke control device and focusing stroke control circuit |
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| CN202222625045.0U CN218332128U (en) | 2022-09-28 | 2022-09-28 | Focusing stroke control device and focusing stroke control circuit |
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| CN218332128U true CN218332128U (en) | 2023-01-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117156250A (en) * | 2023-10-27 | 2023-12-01 | 荣耀终端有限公司 | Driving device, camera module and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117156250A (en) * | 2023-10-27 | 2023-12-01 | 荣耀终端有限公司 | Driving device, camera module and electronic equipment |
| CN117156250B (en) * | 2023-10-27 | 2024-04-09 | 荣耀终端有限公司 | Driving device, camera module and electronic equipment |
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