US20060094331A1 - Toy that reacts in response to information from a motion sensor - Google Patents
Toy that reacts in response to information from a motion sensor Download PDFInfo
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- US20060094331A1 US20060094331A1 US10/975,980 US97598004A US2006094331A1 US 20060094331 A1 US20060094331 A1 US 20060094331A1 US 97598004 A US97598004 A US 97598004A US 2006094331 A1 US2006094331 A1 US 2006094331A1
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- United States
- Prior art keywords
- toy
- motion
- sound
- car
- motion sensor
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Classifications
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H5/00—Musical or noise- producing devices for additional toy effects other than acoustical
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H17/00—Toy vehicles, e.g. with self-drive; ; Cranes, winches or the like; Accessories therefor
- A63H17/26—Details; Accessories
- A63H17/34—Arrangements for imitating the noise of motors
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H18/00—Highways or trackways for toys; Propulsion by special interaction between vehicle and track
- A63H18/16—Control of vehicle drives by interaction between vehicle and track; Control of track elements by vehicles
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H33/00—Other toys
- A63H33/22—Optical, colour, or shadow toys
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H13/00—Toy figures with self-moving parts, with or without movement of the toy as a whole
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H17/00—Toy vehicles, e.g. with self-drive; ; Cranes, winches or the like; Accessories therefor
- A63H17/26—Details; Accessories
- A63H17/28—Electric lighting systems
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H17/00—Toy vehicles, e.g. with self-drive; ; Cranes, winches or the like; Accessories therefor
- A63H17/26—Details; Accessories
- A63H17/30—Direction-indicators
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H17/00—Toy vehicles, e.g. with self-drive; ; Cranes, winches or the like; Accessories therefor
- A63H17/26—Details; Accessories
- A63H17/32—Acoustical or optical signalling devices
Definitions
- Toys that are responsive to their environments can often serve to entertain a child.
- a toy car may have a switch on the front or rear that causes the toy car to change directions when an obstacle is encountered.
- Motion sensors are utilized in devices such as optical mice used to input information to a computing system.
- Optical sensors have been used in robots for detecting motion and for adjusting the propulsion mechanisms of the robots.
- the optical mouse uses photodetectors arranged as an image array of pixels to image the spatial features of generally any micro textured or micro detailed work surface located below the optical mouse.
- Photodetector responses are digitized and stored as a frame into memory.
- Motion produces successive frames of translated patterns of pixel information. The successive frames are compared by cross-correlation to ascertain the direction and amount of movement.
- a toy includes a motion sensor and an output device.
- the motion sensor optically detects motion of the toy with respect to an underlying surface.
- the output device receives information from the motion sensor and generates output signals based on the information from the motion sensor.
- FIG. 1 is a simplified underside view of a toy in accordance with an embodiment of the present invention.
- FIG. 2 is a simplified block diagram of optical motion sensor circuitry used to control generation of output signals in accordance with an embodiment of the present invention.
- FIG. 3 is a simplified flowchart illustrating sound generation for a toy in accordance with an embodiment of the present invention.
- FIG. 1 is a simplified view of the underside of a toy 10 .
- toy 10 is a toy car or some other type of toy that utilizes motion.
- a wheel 11 , a wheel 12 , a wheel 13 and a wheel 14 of toy 10 are used to roll toy 10 along an underlying surface.
- Wheels 11 through 14 are illustrative as more or fewer wheels may be used. Alternatively, wheels may be eliminated and one or more low friction surfaces on the bottom of toy 10 may be used to make contact with the underlying surface.
- an illuminator 17 and an image array 16 are included within an orifice 15 .
- various optics, as necessary or desirable, are included within illuminator 17 and/or image array 16 .
- illuminator 17 is implemented using a light emitting diode (LED), an infrared (IR) LED, or a laser. In cases where it is anticipated that in normal use ambient light is sufficient for image array to detect navigable features of an underlying surface without additional illumination, illuminator 17 can be omitted.
- LED light emitting diode
- IR infrared
- FIG. 2 is a simplified block diagram of an optical motion sensing system.
- Image array 16 is implemented, for example, using a 32 by 32 array of photodetectors. Alternatively, image array 16 can be implemented using other technology and/or other array sizes can be used.
- An analog-to-digital converter (ADC) 21 receives analog signals from image array 16 and converts the signals to digital data.
- the interface between image array 16 and ADC 21 is a serial interface.
- the interface between image array 16 and ADC 21 is a parallel interface.
- An automatic gain control (AGC) 22 evaluates digital data received from ADC 21 and controls shutter speed and gain adjust within image array 16 . This is done, for example, to prevent saturation or underexposure of images captured by image array 16 .
- a navigation engine 24 evaluates the digital data from ADC 21 and performs a series of correlations to estimate the direction and magnitude of motion most likely to account for the difference between images taken at different times. Navigation engine 24 then determines a delta x ( ⁇ X) value to be placed on an output 28 and determines a delta y ( ⁇ Y) value to be placed on an output 29 .
- ⁇ Y represents movement in the forward or reverse direction of the toy and ⁇ X represents sideways motion of the toy.
- ⁇ X and ⁇ Y are absolute values, indicating only amount of movement.
- ⁇ X and ⁇ Y can be either positive or negative. In this case, a positive ⁇ Y indicates forward motion, a negative ⁇ Y indicates motion in a reverse direction, a positive ⁇ X indicates motion toward one side, and a negative ⁇ X indicates motion towards another side.
- Navigation engine 24 also generates a quality signal 27 that indicates the quality of the image detected by image array 16 .
- quality signal 27 represents an estimation of the likelihood that the ⁇ X and ⁇ Y values represent the true motion of the toy with respect to an underlying surface. For example, this likelihood is based on the number of navigable features detected by image array 16 .
- other methodology may be used to determine the quality of the image detected by image array 16 . See, for example, ways quality is determined in U.S. Pat. No. 6,433,780.
- quality signal 27 indicates the likelihood that the ⁇ X and ⁇ Y values do not represent the true motion of the toy with respect to an underlying surface, this indicates that the surface underlying image array 16 is out of focus. For example, if a lens or lenses for image array 16 is/are selected so that an underlying surface very near image array 16 is in focus, quality signal 27 will indicate unacceptable quality when a “lift-off” has occurred. Lift-off indicates that image array 16 has been removed away from an underlying surface, or that the current underlying surface does not have sufficient detectable features to allow motion to be detected. This is useful, for example, for a toy car where a “lift-off” triggers a crash sound.
- a lens or lenses for image array 16 is/are selected so that an underlying surface far (e.g., 1 or 2 meters) from image array 16 is in focus, quality signal 27 will indicate unacceptable quality when a “set down” has occurred. This is useful, for example, for a flying toy, such as toy plane, where a “set down” triggers a crash sound.
- image array 16 can rely on pinholes or other means to obtained desired focus of photodetectors within the image array.
- an illuminator such as illuminator 17 may not be effective. In this case, no illuminator is used, but instead ambient light is used by image array 16 .
- Quality signal 27 is, for example, a binary signal indicating whether quality is acceptable or not acceptable.
- quality signal 27 is a numeric value indicating level of quality.
- optical mice include functionality identical or similar to image array 16 , ADC 21 , AGC 22 and navigation engine 24 .
- this standard functionality or similar functionality of optical mice are implemented, see, for example, U.S. Pat. No. 5,644,139, U.S. Pat. No. 5,578,813, U.S. Pat. No. 5,786,804 and/or U.S. Pat. No. 6,281,882 B1.
- detection of lift-off see, for example, U.S. Pat. No. 6,433,780 B1.
- An output device 25 receives ⁇ X on output 28 and ⁇ Y on output 29 , and based on the values of ⁇ X and ⁇ Y generates an output appropriate to the toy.
- the action may be generation of various sound effects appropriate to the vehicle.
- the toy is a toy animal
- the values of ⁇ X and ⁇ Y can determine the frequency of some movement of the animal or sound made by the animal.
- the values of ⁇ X and ⁇ Y can determine the rate at which wings are made to flap, and so on.
- FIG. 3 is a simplified flowchart illustrating sounds generated for a toy car.
- the toy is turned on or some other event triggers start of the output signal generation process.
- output device 25 obtains a ⁇ X value and a ⁇ Y value.
- ⁇ X and ⁇ Y are each absolute values. This means that the same sound will be generated for equivalent forward and reverse motion, and the same sound will be generated for equivalent for left and right motion.
- navigation engine 24 is able to generate hundreds of ⁇ X values and ⁇ Y values per second.
- the ⁇ X values and the ⁇ Y values received by output device 25 can be averaged over a predetermined amount of time.
- the predetermined amount of time may be, for example, one half second, or any other length of time that results in generation of optimal sound feedback to a child playing with the toy.
- a check is made to see if quality signal 27 is at an acceptable level. If in block 32 , quality signal 27 is not acceptable, this indicates lift-off has detected and in a block 33 a “crash” sound is made, like the sound of a car that has crashed. When the sound is complete, in block 31 new values for ⁇ X value and a ⁇ Y are obtained.
- a check is made to see if ⁇ X is greater than a first value.
- the first value is a predetermined value by the toy designer to provide optimal sound feedback to a child playing with the toy. If in block 34 , ⁇ X is greater than the first value, in a block 35 a squeal sound is made, like the sound of tires squealing. Since ⁇ X indicates motion in a sideways direction, the tire squealing sound simulates the sound of a car taking a turn at a fast speed.
- new values for ⁇ X value and a ⁇ Y are obtained.
- a check is made to see if ⁇ Y is greater than a second value.
- the second value is a predetermined value by the toy designer to provide optimal sound feedback to a child playing with the toy. If in block 36 , ⁇ Y is greater than the second value, in a block 37 a “high rev” sound is made, like that of an engine running at high speed. Since AY indicates motion in a forward or reverse direction, the “high rev” sound simulates the sound of a car traveling at a fast speed. When the sound is complete, in block 31 new values for ⁇ X value and a ⁇ Y are obtained.
- a block 40 an idle sound is made like that of a car idling or moving very slowly.
- new values for ⁇ X value and a ⁇ Y are obtained.
- the sounds and sound triggers given above are exemplary. Other types of toys would make other sounds. For example, if the toy were a dinosaur or other animal, sounds appropriate to the particular animal would be generated based on values of ⁇ X, ⁇ Y, lift-off and/or set down. Instead of sound generation, other output signals can be generated in response to motion. For example, such output signals include varying the intensity or color of light generated, varying the frequency of light pulses, varying the type or frequency of motion of different appendages of the toy, and so.
Abstract
Description
- Toys that are responsive to their environments can often serve to entertain a child. For example, a toy car may have a switch on the front or rear that causes the toy car to change directions when an obstacle is encountered.
- Motion sensors are utilized in devices such as optical mice used to input information to a computing system. Optical sensors have been used in robots for detecting motion and for adjusting the propulsion mechanisms of the robots.
- In one type of optical mouse, the optical mouse uses photodetectors arranged as an image array of pixels to image the spatial features of generally any micro textured or micro detailed work surface located below the optical mouse. Photodetector responses are digitized and stored as a frame into memory. Motion produces successive frames of translated patterns of pixel information. The successive frames are compared by cross-correlation to ascertain the direction and amount of movement. For more information on this type of optical mouse, see, for example, U.S. Pat. No. 6,281,882 B1.
- In accordance with an embodiment of the present invention, a toy includes a motion sensor and an output device. The motion sensor optically detects motion of the toy with respect to an underlying surface. The output device receives information from the motion sensor and generates output signals based on the information from the motion sensor.
-
FIG. 1 is a simplified underside view of a toy in accordance with an embodiment of the present invention. -
FIG. 2 is a simplified block diagram of optical motion sensor circuitry used to control generation of output signals in accordance with an embodiment of the present invention. -
FIG. 3 is a simplified flowchart illustrating sound generation for a toy in accordance with an embodiment of the present invention. -
FIG. 1 is a simplified view of the underside of atoy 10. Forexample toy 10 is a toy car or some other type of toy that utilizes motion. Awheel 11, awheel 12, awheel 13 and awheel 14 oftoy 10 are used to rolltoy 10 along an underlying surface.Wheels 11 through 14 are illustrative as more or fewer wheels may be used. Alternatively, wheels may be eliminated and one or more low friction surfaces on the bottom oftoy 10 may be used to make contact with the underlying surface. - Within an
orifice 15 is shown anilluminator 17 and animage array 16. For example, various optics, as necessary or desirable, are included withinilluminator 17 and/orimage array 16. For example,illuminator 17 is implemented using a light emitting diode (LED), an infrared (IR) LED, or a laser. In cases where it is anticipated that in normal use ambient light is sufficient for image array to detect navigable features of an underlying surface without additional illumination,illuminator 17 can be omitted. -
FIG. 2 is a simplified block diagram of an optical motion sensing system.Image array 16 is implemented, for example, using a 32 by 32 array of photodetectors. Alternatively,image array 16 can be implemented using other technology and/or other array sizes can be used. - An analog-to-digital converter (ADC) 21 receives analog signals from
image array 16 and converts the signals to digital data. For example, the interface betweenimage array 16 and ADC 21 is a serial interface. Alternatively, the interface betweenimage array 16 and ADC 21 is a parallel interface. - An automatic gain control (AGC) 22 evaluates digital data received from
ADC 21 and controls shutter speed and gain adjust withinimage array 16. This is done, for example, to prevent saturation or underexposure of images captured byimage array 16. - A
navigation engine 24 evaluates the digital data fromADC 21 and performs a series of correlations to estimate the direction and magnitude of motion most likely to account for the difference between images taken at different times.Navigation engine 24 then determines a delta x (ΔX) value to be placed on anoutput 28 and determines a delta y (ΔY) value to be placed on anoutput 29. For example, ΔY represents movement in the forward or reverse direction of the toy and ΔX represents sideways motion of the toy. In a preferred embodiment, ΔX and ΔY are absolute values, indicating only amount of movement. In other embodiments of the invention, ΔX and ΔY can be either positive or negative. In this case, a positive ΔY indicates forward motion, a negative ΔY indicates motion in a reverse direction, a positive ΔX indicates motion toward one side, and a negative ΔX indicates motion towards another side. -
Navigation engine 24 also generates aquality signal 27 that indicates the quality of the image detected byimage array 16. For example,quality signal 27 represents an estimation of the likelihood that the ΔX and ΔY values represent the true motion of the toy with respect to an underlying surface. For example, this likelihood is based on the number of navigable features detected byimage array 16. Alternatively, other methodology may be used to determine the quality of the image detected byimage array 16. See, for example, ways quality is determined in U.S. Pat. No. 6,433,780. - Typically, when
quality signal 27 indicates the likelihood that the ΔX and ΔY values do not represent the true motion of the toy with respect to an underlying surface, this indicates that the surface underlyingimage array 16 is out of focus. For example, if a lens or lenses forimage array 16 is/are selected so that an underlying surface verynear image array 16 is in focus,quality signal 27 will indicate unacceptable quality when a “lift-off” has occurred. Lift-off indicates thatimage array 16 has been removed away from an underlying surface, or that the current underlying surface does not have sufficient detectable features to allow motion to be detected. This is useful, for example, for a toy car where a “lift-off” triggers a crash sound. - On the other hand, if a lens or lenses for
image array 16 is/are selected so that an underlying surface far (e.g., 1 or 2 meters) fromimage array 16 is in focus,quality signal 27 will indicate unacceptable quality when a “set down” has occurred. This is useful, for example, for a flying toy, such as toy plane, where a “set down” triggers a crash sound. Alternative to use of a lens or lenses,image array 16 can rely on pinholes or other means to obtained desired focus of photodetectors within the image array. Also, when an underlying surface far (e.g., 1 or 2 meters) fromimage array 16 is in focus, use of an illuminator such asilluminator 17 may not be effective. In this case, no illuminator is used, but instead ambient light is used byimage array 16. -
Quality signal 27 is, for example, a binary signal indicating whether quality is acceptable or not acceptable. Alternatively,quality signal 27 is a numeric value indicating level of quality. - Existing optical mice include functionality identical or similar to
image array 16, ADC 21, AGC 22 andnavigation engine 24. For further information on how this standard functionality or similar functionality of optical mice are implemented, see, for example, U.S. Pat. No. 5,644,139, U.S. Pat. No. 5,578,813, U.S. Pat. No. 5,786,804 and/or U.S. Pat. No. 6,281,882 B1. For an example of the detection of lift-off see, for example, U.S. Pat. No. 6,433,780 B1. - An
output device 25 receives ΔX onoutput 28 and ΔY onoutput 29, and based on the values of ΔX and ΔY generates an output appropriate to the toy. For example, if the toy is a car, plane or other transportation vehicle, the action may be generation of various sound effects appropriate to the vehicle. Alternatively, if the toy is a toy animal, the values of ΔX and ΔY can determine the frequency of some movement of the animal or sound made by the animal. For a toy bird, for example, the values of ΔX and ΔY can determine the rate at which wings are made to flap, and so on. - For example,
FIG. 3 is a simplified flowchart illustrating sounds generated for a toy car. In ablock 30, the toy is turned on or some other event triggers start of the output signal generation process. - In a
block 31,output device 25 obtains a ΔX value and a ΔY value. In this embodiment, for example, ΔX and ΔY are each absolute values. This means that the same sound will be generated for equivalent forward and reverse motion, and the same sound will be generated for equivalent for left and right motion. - In many cases,
navigation engine 24 is able to generate hundreds of ΔX values and ΔY values per second. In this case, the ΔX values and the ΔY values received byoutput device 25 can be averaged over a predetermined amount of time. The predetermined amount of time may be, for example, one half second, or any other length of time that results in generation of optimal sound feedback to a child playing with the toy. - In a
block 32, a check is made to see ifquality signal 27 is at an acceptable level. If inblock 32,quality signal 27 is not acceptable, this indicates lift-off has detected and in a block 33 a “crash” sound is made, like the sound of a car that has crashed. When the sound is complete, inblock 31 new values for ΔX value and a ΔY are obtained. - In a
block 34, a check is made to see if ΔX is greater than a first value. The first value is a predetermined value by the toy designer to provide optimal sound feedback to a child playing with the toy. If inblock 34, ΔX is greater than the first value, in a block 35 a squeal sound is made, like the sound of tires squealing. Since ΔX indicates motion in a sideways direction, the tire squealing sound simulates the sound of a car taking a turn at a fast speed. When the sound is complete, inblock 31 new values for ΔX value and a ΔY are obtained. - In a
block 36, a check is made to see if ΔY is greater than a second value. The second value is a predetermined value by the toy designer to provide optimal sound feedback to a child playing with the toy. If inblock 36, ΔY is greater than the second value, in a block 37 a “high rev” sound is made, like that of an engine running at high speed. Since AY indicates motion in a forward or reverse direction, the “high rev” sound simulates the sound of a car traveling at a fast speed. When the sound is complete, inblock 31 new values for ΔX value and a ΔY are obtained. - In a
block 38, a check is made to see if ΔY is greater than a third value while being less than or equal to the second value. The third value is a predetermined value by the toy designer to provide optimal sound feedback to a child playing with the toy. If inblock 38, ΔY is greater than the third value while being less than or equal to the second value, in a block 39 a “low rev” sound is made, like that of an engine running at a moderate speed. Since ΔY indicates motion in a forward or reverse direction, the “low rev” sound simulates the sound of a car traveling at a moderate speed. When the sound is complete, inblock 31 new values for ΔX value and a ΔY are obtained. - In a
block 40, an idle sound is made like that of a car idling or moving very slowly. When the sound is complete, inblock 31 new values for ΔX value and a ΔY are obtained. - As will be understood by persons of ordinary skill in the art, the sounds and sound triggers given above are exemplary. Other types of toys would make other sounds. For example, if the toy were a dinosaur or other animal, sounds appropriate to the particular animal would be generated based on values of ΔX, ΔY, lift-off and/or set down. Instead of sound generation, other output signals can be generated in response to motion. For example, such output signals include varying the intensity or color of light generated, varying the frequency of light pulses, varying the type or frequency of motion of different appendages of the toy, and so.
- The foregoing discussion discloses and describes merely exemplary methods and embodiments of the present invention. As will be understood by those familiar with the art, the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the disclosure of the present invention is intended to be illustrative, but not limiting, of the scope of the invention, which is set forth in the following claims.
Claims (20)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/975,980 US20060094331A1 (en) | 2004-10-28 | 2004-10-28 | Toy that reacts in response to information from a motion sensor |
CNB2005101058640A CN100563768C (en) | 2004-10-28 | 2005-09-29 | In response to from the information of motion sensor and the toy of reacting |
GB0521185A GB2419541A (en) | 2004-10-28 | 2005-10-18 | Toy that reacts in response to information from a motion sensor |
JP2005308574A JP2006122676A (en) | 2004-10-28 | 2005-10-24 | Toy that reacts in response to information from motion sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/975,980 US20060094331A1 (en) | 2004-10-28 | 2004-10-28 | Toy that reacts in response to information from a motion sensor |
Publications (1)
Publication Number | Publication Date |
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US20060094331A1 true US20060094331A1 (en) | 2006-05-04 |
Family
ID=35451964
Family Applications (1)
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US10/975,980 Abandoned US20060094331A1 (en) | 2004-10-28 | 2004-10-28 | Toy that reacts in response to information from a motion sensor |
Country Status (4)
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US (1) | US20060094331A1 (en) |
JP (1) | JP2006122676A (en) |
CN (1) | CN100563768C (en) |
GB (1) | GB2419541A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070164999A1 (en) * | 2006-01-19 | 2007-07-19 | Gruhlke Russell W | Optical navigation module and lens having large depth of field therefore |
US9802536B2 (en) | 2016-03-31 | 2017-10-31 | Bose Corporation | Acoustic feedback system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8164429B2 (en) * | 2008-07-30 | 2012-04-24 | Mattel, Inc. | Operational-state responsive audiovisual systems |
GB2482119B (en) | 2010-07-19 | 2013-01-23 | China Ind Ltd | Racing vehicle game |
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JP2913501B2 (en) * | 1997-04-25 | 1999-06-28 | 株式会社セガ・エンタープライゼス | Traveling toys and gaming systems |
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2004
- 2004-10-28 US US10/975,980 patent/US20060094331A1/en not_active Abandoned
-
2005
- 2005-09-29 CN CNB2005101058640A patent/CN100563768C/en not_active Expired - Fee Related
- 2005-10-18 GB GB0521185A patent/GB2419541A/en active Pending
- 2005-10-24 JP JP2005308574A patent/JP2006122676A/en not_active Withdrawn
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US6910972B2 (en) * | 2003-06-24 | 2005-06-28 | Steven Norbury | Real-size simulated pneumatic drag strip ride |
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US20070164999A1 (en) * | 2006-01-19 | 2007-07-19 | Gruhlke Russell W | Optical navigation module and lens having large depth of field therefore |
US9802536B2 (en) | 2016-03-31 | 2017-10-31 | Bose Corporation | Acoustic feedback system |
Also Published As
Publication number | Publication date |
---|---|
GB2419541A (en) | 2006-05-03 |
JP2006122676A (en) | 2006-05-18 |
CN1799671A (en) | 2006-07-12 |
CN100563768C (en) | 2009-12-02 |
GB0521185D0 (en) | 2005-11-23 |
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