Camera back focus adjustment device and camera

Abstract

The present invention relates to a camera back focus adjustment device and a camera, comprising a lens end face contact module, and a back focus adjustment device arranged at the bottom of the lens end face contact module; the back focus adjustment device comprises a focus reference plate, a circuit board arranged at the bottom of the focus reference plate, and a focus assembly for adjusting the focal length between the focus reference plate and the circuit board; the circuit board comprises a PCB board, a controller arranged on the PCB board, and a distance measurement module and an indication module electrically connected to the controller respectively. The present invention has high focusing accuracy and short focusing consumption, thereby improving the user's back focus adjustment experience and meeting practical application requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of camera equipment, and in particular to a camera back focus adjustment device and a camera. Background Art

[0002] A camera is an optical device used for photography. After the light reflected by the object is focused by the camera lens (objective lens) and the shutter that controls the exposure, the object forms a latent image on the photosensitive material in the darkroom. After being washed (i.e. developed and fixed), a permanent image is formed. This technology is called photography. As an important part of photography, camera focus plays a vital role in practical applications.

[0003] However, in the prior art, the focusing of the camera is usually performed by controlling the distance between the locking screw and the camera device, which requires the experience of the shooting personnel and repeated operations. Therefore, the focusing accuracy is low and the focusing takes a long time. Summary of the invention

[0004] In order to solve the above problems, an object of the present invention is to provide a camera back focus adjustment device and a camera with high focusing accuracy and short focusing consumption.

[0005] A camera back focus adjustment device comprises a lens end face contact module and a back focus adjustment device arranged at the bottom of the lens end face contact module; the back focus adjustment device comprises a focus reference plate, a circuit board arranged at the bottom of the focus reference plate, and a focus assembly for adjusting the focal length between the focus reference plate and the circuit board; the circuit board comprises a PCB board, a controller arranged on the PCB board, and a distance measurement module and an indication module respectively electrically connected to the controller.

[0006] In addition, the camera back focus adjustment device provided by the present invention may also have the following additional technical features:

[0007] Furthermore, the focusing assembly includes a focusing spring and a focusing screw cooperating with the focusing spring.

[0008] Furthermore, the number of the ranging modules is 4, and the 4 ranging modules are respectively arranged at four feet of the PCB board, and the ranging module includes a signal transmitting unit and a signal receiving unit.

[0009] Furthermore, the signal transmitting unit includes a single power level conversion chip, a switch circuit electrically connected to the single power level conversion chip, and a second acoustic wave probe electrically connected to the single power level conversion chip.

[0010] Furthermore, the signal receiving unit includes a first amplifier circuit, and a second amplifier circuit and a first acoustic wave probe which are electrically connected to the first amplifier circuit in sequence.

[0011] Furthermore, the number of the indication modules is 4, and the 4 distance measuring modules are respectively arranged at four feet of the PCB board and located outside the distance measuring module.

[0012] Furthermore, the indication module includes a first indicator light group and a second indicator light group connected to each other.

[0013] Furthermore, the back focus adjustment device also includes a filter arranged on the focusing reference plate, a recoil pad arranged on the top of the filter, and a pressure plate fixedly connected to the focusing substrate through a fixing member.

[0014] Furthermore, the lens end surface contact module includes an adapter plate disposed on the top of the pressure plate and fixedly connected to the focusing substrate, a bracket disposed on the top of the adapter plate, and a lens connecting seat connected to the bracket via a spring sheet.

[0015] An embodiment of the present invention further provides a camera, wherein the camera includes the camera back focus adjustment device as described above.

[0016] The camera back focus adjustment device proposed in the present invention comprises a lens end face contact module, and a back focus adjustment device arranged at the bottom of the lens end face contact module; the back focus adjustment device comprises a focus reference plate, a circuit board arranged at the bottom of the focus reference plate, and a focus assembly for adjusting the focal length between the focus reference plate and the circuit board; the circuit board comprises a PCB board, a controller arranged on the PCB board, and a distance measurement module and an indication module electrically connected to the controller respectively. The present invention has high focusing accuracy and short focusing consumption, thereby improving the user's back focus adjustment experience and meeting practical application needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural block diagram of a camera back focus adjustment device provided by an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Explosion view of

[0019] Figure 3 is a circuit diagram of the controller on the circuit board;

[0020] Figure 4 It is a circuit diagram of the signal transmitting unit in the ranging module;

[0021] Figure 5 It is a signal receiving unit in the ranging module;

[0022] Figure 6 is a circuit diagram of a first indicator light group in an indicator module;

[0023] Figure 7 This is a circuit diagram of the second indicator light group in the indicator module.

[0024] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0025] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. Several embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] like Figures 1 to 7 As shown, based on the above problems, an embodiment of the present invention discloses a camera back focus adjustment device, including a lens end surface contact module 10, and a back focus adjustment device 20 arranged at the bottom of the lens end surface contact module 10, and the back focus adjustment device 20 is used to adjust the back focus of the camera through the lens contact module.

[0029] The back focus adjustment device 20 includes a focus reference plate 21, a circuit board 22 disposed at the bottom of the focus reference plate 21, and a focus assembly 23 for adjusting the focal length between the focus reference plate 21 and the circuit board 22. The focus reference plate 21 is provided with a mounting notch in the middle thereof for cooperating with the circuit board 22, and the focus reference plate 21 is provided with threaded posts for mounting the circuit board 22 around the mounting notch. The focus assembly 23 passes through the mounting holes on the circuit board and the threaded posts on the focus reference plate in sequence and is connected to the lens contact panel. The circuit board is provided with a boss for passing through the mounting notch.

[0030] The circuit board includes a PCB board, a controller disposed on the PCB board, and a distance measurement module and an indication module electrically connected to the controller respectively. Figure 3 As shown, the controller is an MCU controller, and the chip model of the controller is STM8L051F3, which is used to measure the distance through the ranging module, calculate the current distance value, and control the indication module to perform focusing indication.

[0031] For further information, see Figures 4 to 5 , the number of the distance measuring modules is 4, and the 4 distance measuring modules are respectively arranged at four feet of the PCB board, and the distance measuring module includes a signal transmitting unit and a signal receiving unit. The signal transmitting unit includes a single power supply level conversion chip U2, a switch circuit electrically connected to the single power supply level conversion chip U2, and a second acoustic wave probe B2 electrically connected to the single power supply level conversion chip U2. The signal receiving unit includes a first amplifier circuit, and a second amplifier circuit and a first acoustic wave probe electrically connected to the first amplifier circuit in sequence.

[0032] Specifically, the model of the single power level conversion chip U2 is MAX232-1, and the VCC end of the single power level conversion chip U2 is electrically connected to the switch circuit. The switch circuit includes a PNP type sixth transistor Q6, a first end 1 of the sixth transistor Q6 is connected to the PB1 pin of the controller through a resistor R35, a second end 2 of the sixth transistor is connected to a 5V power supply, and a third end 3 of the sixth transistor Q6 is electrically connected to the VCC end of the single power level conversion chip U2. In addition, the T1OUT end and the T2OUT end of the single power level conversion chip U2 are electrically connected to the second acoustic wave probe B2.

[0033] Specifically, the first amplifier circuit includes a fifth transistor Q5, and the second amplifier circuit includes an operational amplifier U1 with a signal of TL074. The third end 3 of the fifth transistor Q5 is electrically connected to a 5V power supply through a resistor R1, and is electrically connected to the 1IN+ pin of the operational amplifier U1 through a resistor R21. The second end 2 of the fifth transistor Q5 is grounded, and is connected to the first end 1 of the fifth transistor Q5 through a resistor R19, and the first end 1 of the fifth transistor Q5 is electrically connected to the 1OUT pin of the operational amplifier U1. The first acoustic wave probe B1 is electrically connected to the operational amplifier U1 through a filter circuit. Among them, the 2IN- pin and the 2OUT pin of the operational amplifier U1 are electrically connected to the PB2 pin of the MCU controller through a resistor. The filter circuit is an RC filter circuit, one end of which is electrically connected to the 4OUT pin of the operational amplifier U1, and the other end is electrically connected to the first acoustic wave probe B1.

[0034] For further information, see Figure 6 to Figure 7 The number of the indication modules is 4, and the 4 distance measuring modules are respectively arranged at four feet of the PCB board and located outside the distance measuring modules. The indication module includes a first indicator light group and a second indicator light group connected to each other.

[0035] Specifically, the first indicator light group includes a second transistor Q2 electrically connected to the LED_GREEN pin controlled by the MCU, the first end 1 of the second transistor Q2 is electrically connected to the MCU controller through a resistor R15, the second end 2 of the second transistor Q2 is grounded, and the third end 3 of the second transistor Q2 is electrically connected to the green light-emitting diodes D5~D8 in parallel.

[0036] Specifically, the second indicator light group includes a first transistor Q1 electrically connected to the LED_RED pin controlled by the MCU, the first end 1 of the first transistor Q1 is electrically connected to the MCU controller through a resistor R8, the second end 2 of the first transistor Q1 is grounded, and the third end 3 of the first transistor Q1 is electrically connected to the red light-emitting diodes D1~D4 in parallel.

[0037] Furthermore, the focus assembly 23 includes a focus spring 231 and a focus screw 232 that cooperates with the focus spring 231. By setting the focus spring 231, when the distance between the lens end face contact module 10 and the back focus adjustment device 20 does not meet the requirements, the focus screw 232 is controlled to move forward and backward, and the focus screw 232 is fixed by gluing when the distance is appropriate.

[0038] It can be understood that during the assembly process of the lens end face contact module 10 and the back focus adjustment device 20, a high level of about 1MS is output through the PB1 pin of the MCU and the current time point T1 is recorded. After the signal transmitting unit receives the PB1 signal, Q6 is turned on, and the signal transmitting unit transmits ultrasonic waves through B2. The sound waves are reflected after encountering an obstacle, and B2 receives the reflected sound waves. After filtering and amplification by TL074, the signal is transmitted to the PB2 pin of the MCU. The PB2 pin of the MCU receives the signal of TL074 and records the time T2 at this time. The time difference △T=T2-T1, V=340M / S, and the distance S=V*△T / 2. When S>preset value or <preset value, the pin of the MCU is set low, the red light is on, and the green light is off; when S=preset value, the pin of the MCU is set high, the red light is off, and the green light is on.

[0039] Furthermore, the back focus adjustment device 20 also includes a filter 24 disposed on the focus reference plate 21, a recoil pad 25 disposed on the top of the filter 24, and a pressure plate 26 fixedly connected to the focus substrate 21 through a fixing member. The pressure plate is provided with a mounting groove that cooperates with the recoil pad, the focus substrate 21 is provided with a limit column that cooperates with the pressure plate, and the recoil pad is fixedly connected to the focus substrate 21 through a screw.

[0040] Furthermore, the lens end face contact module 10 includes an adapter plate 11 disposed on the top of the pressure plate 26 and fixedly connected to the focus substrate 21, a bracket 12 disposed on the top of the adapter plate 11, and a lens connection seat 14 connected to the bracket 12 via a spring sheet 13. The adapter plate is provided with a support column that cooperates with the bracket, and the lens connection seat is fixedly connected to the adapter plate via bolts passing through the bracket. The spring sheet disposed between the bracket 12 and the lens connection seat 14 facilitates the installation of the lens.

[0041] It should also be noted that an embodiment of the present invention further provides a camera, which includes the camera back focus adjustment device as described above.

[0042] The present invention proposes a camera back focus adjustment device and a camera, comprising a lens end face contact module, and a back focus adjustment device arranged at the bottom of the lens end face contact module; the back focus adjustment device comprises a focus reference plate, a circuit board arranged at the bottom of the focus reference plate, and a focus assembly for adjusting the focal length between the focus reference plate and the circuit board; the circuit board comprises a PCB board, a controller arranged on the PCB board, and a distance measurement module and an indication module electrically connected to the controller respectively. The present invention has high focusing accuracy and short focusing consumption, thereby improving the user's back focus adjustment experience and meeting practical application requirements.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0044] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A camera back focus adjustment device, characterized in that: The invention comprises a lens end face contact module and a back focus adjustment device arranged at the bottom of the lens end face contact module; the back focus adjustment device comprises a focus reference plate, a circuit board arranged at the bottom of the focus reference plate, and a focus assembly for adjusting the focal length between the focus reference plate and the circuit board; the circuit board comprises a PCB board, a controller arranged on the PCB board, and a distance measurement module and an indication module respectively electrically connected to the controller; The back focus adjustment device is used to adjust the back focus of the camera through the lens end surface contact module, and the controller is an MCU controller, which is used to measure the distance through the distance measurement module, calculate the current distance value, and control the indication module to give a focus indication; The focus adjustment assembly includes a focus adjustment spring and a focus adjustment screw that cooperates with the focus adjustment spring; through the arrangement of the focus adjustment spring, when the distance between the lens end surface contact module and the back focus adjustment device does not meet the requirements, the focus adjustment screw is controlled to move forward and backward, and the focus adjustment screw is fixed by gluing when the distance is appropriate; The number of the distance measuring modules is 4, and the 4 distance measuring modules are respectively arranged at four feet of the PCB board, and the distance measuring module includes a signal transmitting unit and a signal receiving unit; The signal transmitting unit includes a single power level conversion chip, a switch circuit electrically connected to the single power level conversion chip, and a second acoustic wave probe electrically connected to the single power level conversion chip.

2. The camera back focus adjustment device according to claim 1, characterized in that: The signal receiving unit includes a first amplifier circuit, and a second amplifier circuit and a first acoustic wave probe which are electrically connected to the first amplifier circuit in sequence.

3. The camera back focus adjustment device according to claim 1, characterized in that: The number of the indicating modules is 4, and the 4 distance measuring modules are respectively arranged at four feet on the PCB board and located outside the distance measuring modules.

4. The camera back focus adjustment device according to claim 3, characterized in that: The indication module includes a first indication light group and a second indication light group which are connected to each other.

5. The camera back focus adjustment device according to claim 1, characterized in that: The back focus adjustment device also includes a filter arranged on the focus reference plate, a recoil pad arranged on the top of the filter, and a pressure plate fixedly connected to the focus reference plate through a fixing member.

6. The camera back focus adjustment device according to claim 5, characterized in that: The lens end surface contact module comprises an adapter plate arranged on the top of the pressure plate and fixedly connected to the focus adjustment substrate, a bracket arranged on the top of the adapter plate, and a lens connection seat connected to the bracket through a spring sheet.

7. A camera, characterized in that: The camera back focus adjustment device comprises the device described in any one of claims 1 to 6.

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