# US 11,307,053 B2 · Device with position detection

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- Number: US 11,307,053 B2
- Document ID: US11307053B2
- Status: Granted
- Kind: B2
- Application number: 16/884,880
- Filed: 2020-05-27
- Published: 2021-08-05
- Granted: 2022-04-19
- Earliest claimed: 2020-02-04
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Sung Man Pang
- Web page: https://patentgrep.com/patent/US11307053B2

## CPC

- G01D 5/145: {influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06)}
- G01R 33/0017: {Means for compensating offset magnetic fields or the magnetic flux to be measured; Means for generating calibration magnetic fields}
- G01R 33/0035: {Calibration of single magnetic sensors, e.g. integrated calibration}
- G01R 33/0041: {using feed-back or modulation techniques}
- G01R 33/0047: {Housings or packaging of magnetic sensors (packaging of semiconductor devices H10W99/00); Holders}
- G01R 33/0082: {Compensation, e.g. compensating for temperature changes}
- G01R 33/07: Hall effect devices
- G02B 7/04: with mechanism for focusing or varying magnification
- G02B 7/08: adapted to co-operate with a remote control mechanism
- G02B 27/646: {compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68)}
- G03B 3/10: Power-operated focusing
- G03B 5/00: Adjustment of optical system relative to image or object surface other than for focusing
- G03B 17/02: Bodies
- G03B 30/00: Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
- H04N 23/54: Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
- H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof
- H04N 23/57: Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
- H04N 23/60: Control of cameras or camera modules
- G01R 33/0076: {Protection, e.g. with housings against stray fields}
- G03B 2205/0015: by displacing one or more optical elements normal to the optical axis
- G03B 2205/0069: using electromagnetic actuators, e.g. voice coils
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A device with position detection includes: a first hall element; a second hall element; a differential amplifier configured to generate a subtraction voltage by differentially amplifying a first hall voltage generated by the first hall element and a second hall voltage generated by the second hall element; a summing amplifier configured to generate a sum voltage by summatively amplifying the first and second hall voltages; a comparer configured to compare a reference voltage with the subtraction voltage to generate an error voltage; and a current converter configured to generate a bias current provided to the first and second hall elements, based on the error voltage, wherein the device is configured to detect a position of a detection object based on the sum voltage.

## Claims

### Claim 1

A device with position detection, comprising:
a first hall element;
a second hall element;
a differential amplifier configured to generate a subtraction voltage by applying an amplification gain to differentially amplify a first hall voltage generated by the first hall element and a second hall voltage generated by the second hall element;
a summing amplifier configured to generate a sum voltage by applying the amplification gain to summatively amplify the first and second hall voltages;
a comparer configured to compare a reference voltage with the subtraction voltage to generate an error voltage; and
a current converter configured to generate a bias current provided to the first and second hall elements, by applying a voltage-conversion gain to the error voltage,
wherein the voltage-current conversion gain and the amplification gain are determined based on a magnetic field of the first hall element and a magnetic field of the second hall element, and
wherein the device is configured to detect a position of a detection object based on the sum voltage.

### Claim 2 (depends on 1)

The device of claim 1, wherein the sum voltage satisfies:
Vsum
=
Vref
*
G
*
A
*
S
*
(
M
⁢
⁢
1
+
M
⁢
⁢
2
)
1
+
G
*
A
*
S
*
(
M
⁢
⁢
1
-
M
⁢
⁢
2
)
,
wherein Vsum is the sum voltage, Vref is the reference voltage, G is a voltage-current conversion gain of the current converter, A is the amplification gain, S is a magnetic field sensitivity, M1 is the magnetic field of the first hall element, and M2 is the magnetic field of the second hall element.

### Claim 3 (depends on 2)

The device of claim 2, wherein the sum voltage, the reference voltage, the voltage-current conversion gain, the amplification gain, the magnetic field sensitivity, the magnetic field of the first hall element, and the magnetic field of the second hall element satisfy:
1
G
*
A
*
S
⪡
M
⁢
⁢
1
-
M
⁢
⁢
2.

### Claim 4 (depends on 3)

The device of claim 3, wherein the sum voltage, the reference voltage, the voltage-current conversion gain, the amplification gain, the magnetic field sensitivity, the magnetic field of the first hall element, and the magnetic field of the second hall element satisfy:
1
100
≤
1
G
*
A
*
S
*
(
M
⁢
⁢
1
-
M
⁢
⁢
2
)
≤
1
10000
.

### Claim 5 (depends on 3)

The device of claim 3, wherein the sum voltage is determined based on a ratio of a difference between the magnetic field of the first hall element and the magnetic field of the second hall element to a sum of the magnetic field of the first hall element and the magnetic field of the second hall element.

### Claim 6 (depends on 1)

The device of claim 1, wherein the comparer is configured to differentiate the reference voltage from the subtraction voltage.

### Claim 7 (depends on 1)

The device of claim 1, wherein a magnetic field sensitivity of the first hall element and a magnetic field sensitivity of the second hall element are equal.

### Claim 8 (depends on 1)

The device of claim 1, wherein amplification gains of the differential and summing amplifiers are equal.

### Claim 9

A device with position detection, comprising:
a first hall element;
a second hall element;
a differential amplifier configured to apply an amplification gain to a first hall voltage generated by the first hall element and a second hall voltage generated by the second hall element to generate a subtraction voltage;
a summing amplifier configured to apply the amplification gain to the first and second hall voltages to generate a sum voltage;
a comparer configured to compare a reference voltage with the subtraction voltage to generate an error voltage; and
a current converter configured to apply a voltage-current conversion gain to the error voltage to generate a bias current provided to the first and second hall elements based on the error voltage,
wherein the voltage-current conversion gain and the amplification gain are determined based on a magnetic field of the first hall element and a magnetic field of the second hall element.

### Claim 10 (depends on 9)

The device of claim 9, wherein the sum voltage satisfies:
Vsum
=
Vref
*
G
*
A
*
S
*
(
M
⁢
⁢
1
+
M
⁢
⁢
2
)
1
+
G
*
A
*
S
*
(
M
⁢
⁢
1
-
M
⁢
⁢
2
)
,
wherein Vsum is the sum voltage, Vref is the reference voltage, G is a voltage-current conversion gain of the current converter, A is the amplification gain, S is a magnetic field sensitivity, M1 is the magnetic field of the first hall element, M2 is the magnetic field of the second hall element.

### Claim 11 (depends on 10)

The position detecting device of claim 10, wherein the sum voltage, the reference voltage, the voltage-current conversion gain, the amplification gain, the magnetic field sensitivity, the magnetic field of the first hall element, and the magnetic field of the second hall element satisfy:
1
G
*
A
*
S
⪡
M
⁢
⁢
1
-
M
⁢
⁢
2.

### Claim 12 (depends on 11)

The device of claim 11, wherein the sum voltage, the reference voltage, the voltage-current conversion gain, the amplification gain, the magnetic field sensitivity, the magnetic field of the first hall element, and the magnetic field of the second hall element satisfy:
1
100
≤
1
G
*
A
*
S
*
(
M
⁢
⁢
1
-
M
⁢
⁢
2
)
≤
1
10000
.

### Claim 13 (depends on 11)

The device of claim 11, wherein the sum voltage is determined based on a ratio of a difference between the magnetic field of the first hall element and the magnetic field of the second hall element to a sum of the magnetic field of the first hall element and the magnetic field of the second hall element.

### Claim 14 (depends on 9)

The device of claim 9, wherein the comparer is configured to differentiate the reference voltage from the subtraction voltage.

### Claim 15 (depends on 9)

The device of claim 9, wherein a magnetic field sensitivity of the first hall element and a magnetic field sensitivity of the second hall element are equal.

### Claim 16

A camera module, comprising:
a lens barrel;
an aperture module coupled to the lens barrel and comprising an aperture configured to control an amount of light incident to the lens barrel;
a coil;
a magnet configured to move together with either one of the lens barrel and a component setting an opening size of the aperture;
a driver configured to configured to apply a driving signal to the coil to cause the magnet to move based on electromagnetic interaction between the coil and the magnet; and
a position detecting device comprising:
a first hall element;
a second hall element;
a differential amplifier configured to generate a subtraction voltage by applying an amplification gain to differentially amplify a first hall voltage generated by the first hall element and a second hall voltage generated by the second hall element;
a summing amplifier configured to generate a sum voltage by applying the amplification gain to summatively amplify the first and second hall voltages;
a comparer configured to compare a reference voltage with the subtraction voltage to generate an error voltage; and
a current converter configured to generate a bias current provided to the first and second hall elements, by applying a voltage-conversion gain to the error voltage,
wherein the voltage-current conversion gain and the amplification gain are determined based on a magnetic field of the first hall element and a magnetic field of the second hall element, and
wherein the position detecting device is configured to detect a position of the magnet based on the sum voltage.

### Claim 17 (depends on 16)

The camera module of claim 16, wherein the position detecting device is further configured to generate a feedback signal based on the sum voltage, and
wherein the driver is further configured to generate the driving signal based on the feedback signal and an input signal indicating a target position of the magnet.