JP2008233551A - Projector apparatus, projection control method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To always maintain an accurate focusing state over a long term by taking into consideration the deterioration in performance to changes due to aging of a sensor. <P>SOLUTION: The projector apparatus is equipped with a projection part (14 to 25) forming a light figure, projecting the formed light figure by a lens optical system, having an automatic focus function and providing an image on a projection target surface; a temperature sensor 27 for detecting the temperature of the optical lens unit 22 of the projection part (14 to 25); a program memory 29 stored with a table, where a revision value corresponding to a detection result by the temperature sensor 27 is set; and a control part 28, referring to the table stored in the program memory 29, according to the detection result by the temperature sensor 27, making the position of a focus lens 22a of the optical lens unit 22 move according to the obtained corrected value, thereby correcting image location by the automatic focus function, receiving the fine adjustment input of the position of the focus lens 22a relative to the revised image location, and making the table stored in the program memory 29 updated and set, according to the received fine adjustment input. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projection apparatus, a projection control method, and a program suitable for, for example, a projector having an automatic focusing function.

Conventionally, in the case of a liquid-type projection display device, when a focus shift occurs due to a change in the temperature of the coolant, the temperature of the coolant is adjusted so that the focus shift is automatically corrected to always obtain the best projected image. A technique has been considered in which a rotation direction and a rotation amount of a motor that drives a focus lens are controlled in accordance with a detected temperature detected by a temperature sensor. (For example, Patent Document 1)
Also, in the projection display device, even if time elapses after the light source is turned on, time measurement is started when the light source is turned on so that the focus lens group is moved according to the time and no focus shift occurs. The focus correction amount is calculated based on the time table of the amount of deviation due to, and after correcting by adding the correction amount for each mode to the focus correction amount, the focus motor is driven and the focus lens group is moved to perform focus correction. Technology to do is considered. (For example, Patent Document 2)
JP 2000-244847 A JP 2006-163060 A

  The techniques described in the above Patent Documents 1 and 2 correct the amount of wrinkle generated in the focus lens with reference to the temperature of the lens or the time after the light source lamp is turned on, so that an accurate focus state is obtained. It is intended to be maintained.

  However, in actual products, the characteristics of each sensor, optical lens, etc. vary greatly from one individual to another. Therefore, in addition to the fundamental correction described in Patent Documents 1 and 2, each individual product before factory shipment It was necessary to adjust the focus correction amount by performing calibration.

  However, when the projector device is purchased by the user and used for a long period of time, the initial focus accuracy can be maintained as the various sensors and optical lens systems change over time, specifically, the detection accuracy deteriorates. The focus position is gradually shifted.

  Regarding the shift of the focus state due to such a change with the passage of time or the like, the techniques described in the above-mentioned Patent Documents 1 and 2 cannot cope with it at all.

  The present invention has been made in view of the above circumstances, and its object is to always maintain an accurate focus state over a long period of time, taking into account the deterioration of performance due to changes over time of the sensor. And a projection control method and program are provided.

  The invention according to claim 1 forms a light image using light from a light source, projects the formed light image by a lens optical system having an automatic focusing function, and forms an image on a projection target surface; and The temperature detection means for detecting the temperature of the lens optical system of the projection means, the table storage means for storing a table in which a correction value corresponding to the detection result of the temperature detection means is stored, and the detection result of the temperature detection means Accordingly, the table stored in the table storage means is referred to, and the projection control means for correcting the imaging position by the automatic focusing function by moving the specific lens position in the lens optical system of the projection means by the obtained correction value. A fine adjustment input means for receiving a fine adjustment input of the specific lens position with respect to the imaging position corrected by the projection control means, and the table according to the fine adjustment input received by the fine adjustment input means. To a table stored in the storage means equipped and updating means for updating set and said.

  According to a second aspect of the present invention, in the first aspect of the invention, the updating means is a fine adjustment input in which correction values at both ends of the set temperature range are fixedly received with respect to the table stored in the table storage means. It is characterized in that the interpolation process associated with is executed.

  According to a third aspect of the present invention, in the first aspect of the present invention, the updating unit is configured to update the entire correction value within the set temperature range with the fine adjustment input received with respect to the table stored in the table storage unit. It is characterized by a uniform shift.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, a mode for performing a normal projection operation and a calibration mode for correcting a specific lens position in the lens optical system of the projection means are switched and set. A mode setting unit is further provided, and the fine adjustment input unit and the updating unit are effective when the calibration mode is set by the mode setting unit.

  The invention according to claim 5 includes a projection unit that forms an optical image using light from a light source, projects the formed optical image by a lens optical system having an automatic focusing function, and forms an image on a projection target surface. A projection control method for a projection apparatus, which stores in advance a temperature detection step for detecting the temperature of the lens optical system of the projection unit and a table in which correction values corresponding to detection results in the temperature detection step are set. Refer to the table stored in the table storage step according to the detection result in the storage step and the temperature detection step, and move the specific lens position in the lens optical system of the projection unit according to the obtained correction value to automatically A projection control step for correcting the imaging position by the focusing function, a fine adjustment input step for accepting a fine adjustment input of the specific lens position with respect to the imaging position corrected in the projection control step, and the fine adjustment input step. Characterized in that and a update step of updating set the table according to the fine adjustment input with.

  The invention described in claim 6 includes a projection unit that forms an optical image using light from a light source, projects the formed optical image by a lens optical system having an automatic focusing function, and forms an image on a projection target surface. A program executed by a computer incorporated in the projection apparatus, wherein the temperature detection step detects the temperature of the lens optical system of the projection unit, and a table in which correction values corresponding to the detection results in the temperature detection step are set A table storage step for storing in advance, and a table stored in the table storage step according to the detection result in the temperature detection step, and a specific lens position in the lens optical system of the projection unit based on the obtained correction value And a projection control step for correcting the imaging position by the automatic focusing function, and the specific lens position relative to the imaging position corrected in the projection control step. And fine adjustment input step of accepting an adjustment input, characterized in that to perform the updating step of updating set the table to the computer in response to the fine adjustment input accepted by the fine adjustment input step.

  According to the present invention, it is possible to always maintain an accurate focus state over a long period of time in consideration of degradation of performance due to changes with time of the sensor.

  Hereinafter, an embodiment when the present invention is applied to a DLP (Digital Light Processing) (registered trademark) projector apparatus will be described with reference to the drawings.

  FIG. 1 shows a configuration of an electronic circuit of a projector apparatus 10 according to the present embodiment. In the figure, image signals of various standards input from the input / output connector unit 11 are unified into image signals of a predetermined format by the image conversion unit 13 via the input / output interface (I / F) 12 and the system bus SB. Is sent to the projection processing unit 14.

  The projection processing unit 14 develops and stores the transmitted image signal in the video RAM 15, and then generates a video signal from the stored contents of the video RAM 15. The projection processor 14 multiplies the frame rate of this video signal, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations, thereby performing a spatial light modulator ( For example, the micromirror element 16 which is SOM) is driven to display.

  On the other hand, a light source lamp 18 using, for example, an ultra-high pressure mercury lamp disposed in the reflector 17 emits white light with high luminance. The white light emitted from the light source lamp 18 is colored into primary colors in a time-sharing manner through the color wheel 19, and is converted into a luminous flux having a uniform luminance distribution by the integrator 20, then totally reflected by the mirror 21 and reflected on the micromirror element 16. Irradiated.

  Thus, an optical image is formed by the reflected light from the micromirror element 16, and the formed optical image is projected and displayed via the optical lens unit 22 on a screen (not shown) to be projected.

  The optical lens unit 22 enlarges and projects the optical image formed by the micromirror element 16 onto a target such as a screen, and the focus position and the zoom position (projection angle of view) can be arbitrarily changed. .

  Among these, the focus position is controlled by the focus lens 22a moving back and forth along the optical axis direction as indicated by an arrow A in the figure. The focus lens 22a is controlled by the stepping motor (M) 23. It moves by rotational drive.

  However, the projection light processing unit 25 executes lighting driving of the light source lamp 18, rotation driving of the motor (M) 24 that rotates the color wheel 19, rotation driving of the stepping motor 23, and the like.

  The projection light processing unit 25 is also attached to the reflector 17 to detect the temperature of the light source lamp 18 and a part of the outer peripheral surface of the lens barrel of the optical lens unit 22 to attach the focus lens 22a. The temperature data from the temperature sensor 27 that detects the temperature of the optical lens unit 22 is input.

  The control unit 28 controls all the operations of the above circuits. The control unit 28 includes a CPU, a work memory, and the like, and performs control operations using an operation program, various fixed data, a temperature correction table, which will be described later, and the like that are fixedly stored in a program memory 29 that is a nonvolatile memory such as an EEPROM. Execute.

  The control unit 28 is further connected to a ranging processing unit 30 and an audio processing unit 31 via the system bus SB.

  The distance measurement processing unit 30 controls and drives a distance measurement sensor 32 including two pairs of phase difference sensors arranged orthogonally close to the optical lens unit 22 on the front surface of the projector device 10, and arbitrarily selects from the detection outputs thereof. The distance to the point position is calculated, and the calculated distance value data is sent to the control unit 28.

  The sound processing unit 31 includes a sound source circuit such as a PCM sound source, converts the sound data given at the time of the projection operation into analog, and drives a speaker 33 provided on, for example, the back surface of the main body casing of the projector device 10 to emit sound, or If necessary, beep sound is generated.

An operation signal corresponding to a user's key operation is directly input to the control unit 28 from the key switch unit 34 and the Ir light receiving unit 35.
Examples of the key switch unit 34 include a power key, zoom key, focus key, input selection key, “Mode” key, cursor (“↑”, “↓”, “←”, “→”) key, “Enter” key, and “Cancel”. It is assumed that the same key is also provided on a remote controller (not shown) of the projector device 10.

  The Ir light receiving unit 35 is provided on the front and rear surfaces of the main body casing of the projector device 10, demodulates an infrared light modulation signal from a remote controller (not shown), converts it into a code signal, and sends it to the control unit 28.

Next, the operation of the above embodiment will be described.
FIG. 2 shows the processing contents relating to the correction of the position of the focus lens 22a of the optical lens unit 22, which is performed in parallel with the normal projection operation by the control unit 28 after the power of the projector apparatus 10 is turned on. .

  Initially, the light source lamp 18 is first turned on (step S01). At the same time, the focus lens 22a of the optical lens unit 22 is moved to a preset initial position (step S02).

  At the same time, the time of the temperature correction timer provided in the control unit 28, which automatically counts the period for performing the temperature correction process thereafter, is started (step S03).

  Thereafter, it is determined whether or not it is time to correct the temperature of the position of the focus lens 22a based on whether or not the time measurement content of the temperature correction timer has reached a predetermined value (step S04).

  If it is determined that the timing of the temperature correction timer has not yet reached the predetermined value and it is not the time to correct the temperature of the position of the focus lens 22a, the position of the focus lens 22a is then moved manually. It is determined whether or not the focus key has been operated based on whether or not there is an input from the key switch unit 34 or the Ir light receiving unit 35 (step S05).

  If it is determined in step S05 that the focus key has not been operated, the process returns to step S04.

  Thereafter, by repeatedly executing the processes of steps S04 and S05, it is time to correct the temperature of the position of the focus lens 22a or wait for the user to operate the focus key.

  If it is time to correct the temperature of the position of the focus lens 22a, this is determined in step S04, and the temperature data of the optical lens unit 22 is acquired by the temperature sensor 27 via the projection light processing unit 25 ( Step S06).

  Next, using the acquired temperature data, the correction amount of the focus lens 22a is acquired with reference to the temperature correction table LT stored in advance in the program memory 29 (step S07).

  FIG. 3A-1 illustrates the contents of the temperature correction table LT in the initial state stored in the program memory 29. This figure corrects the number of (+/−) steps before and after correcting the driving position of the focus lens 22a by combining the tenth position of the temperature data detected by the temperature sensor 27 with the vertical axis and the first position with the horizontal axis. Read as value.

FIG. 3A-2 is a graph of the contents of the temperature correction table LT in the initial state shown in FIG. 3A-1, and the correction amount of the focus lens 22a changes linearly according to the temperature data. According to the correction value read from the temperature correction table LT in this way, the normal driving position of the focus lens 22a at that time is moved via the projection light processing unit 25 and the stepping motor 23 (step S08).

  Then, after restarting the timing of the temperature correction timer (step S09), the process returns to the standby process from step S04.

  If it is determined in step S05 that the focus key has been operated by the user, the position of the focus lens 22a at that time is temporarily stored in the control unit 28 (step S10) and then operated by the user. Then, the focus lens 22a is moved (step S11), and it is determined whether or not the operation of the focus key is released (step S12).

  Here, while the focus key is still operated, the focus lens 22a is moved in step S11 according to the operation.

  While the focus key is operated in this way, the operations of steps S11 and S12 are repeatedly executed, and the movement of the focus lens 22a is continued.

  Then, when the operation of the focus key is released, this is determined in step S12, the movement of the focus lens 22a is stopped, and the position of the focus lens 22a after the new movement is held (step S13). ).

  However, the difference between the lens positions before and after the movement of the focus lens is calculated, and the focus key operation obtains an accurate focus state depending on whether or not the value is equal to or less than a preset specified amount. It is determined whether the adjustment is a fine adjustment for the user or an operation based on a new projection target by changing the installation position of the projector device 10 (step S14).

  If it is determined that the operation is not for fine adjustment, a readjustment timer for counting the operation time for fine adjustment provided in the control unit 28 is started (step S20). The process returns to the standby process from step S04.

  Further, if it is determined in step S14 that the difference between the lens positions before and after the movement of the focus lens is equal to or less than a predetermined amount and the operation of the focus key is a fine adjustment for obtaining an accurate focus state, the fine adjustment is performed. The count value of the readjustment timer that counts the operation time for the reference time is referred to (step S15), and it is determined whether or not the focus key operation is for fine adjustment over a predetermined time set in advance (step S15). Step S16).

  If the time required for the focus key operation is less than the specified value, the focus key operation is not for fine adjustment, but based on a new projection target by changing the installation position of the projector device 10 or the like. As a result, the process proceeds to step S20 to start a readjustment timer for counting the operation time for fine adjustment, and then returns to the standby process from step S04.

  If it is determined in step S16 that the time required for the focus key operation is equal to or greater than the specified value and an operation for fine adjustment has been performed, the temperature sensor 27 passes through the projection light processing unit 25 to determine the current time. The temperature data of the optical lens unit 22 is acquired (step S17), and the correction value of the temperature correction table LT of the program memory 29 corresponding to the acquired temperature data of the focus lens 22a is changed and set (step S18).

  FIG. 3B-1 shows the case where the position of the focus lens 22a after the fine adjustment operation by the user is the “+8” step, and the temperature data of the optical lens unit 22 at that time is “44 °”. The content after the change setting of the temperature correction table LT is illustrated as an example, and FIG. 3 (B) -2 is a graph of this.

  Here, as shown in FIG. 3A-1, the initial position of the focus lens 22a is in the “+4” step when the temperature data is “44 °”. +8 ”step is shown, and the fine adjustment operation is reflected in the temperature correction table LT.

  Such fine adjustment by the user is considered to be caused by, for example, the performance deterioration of the temperature sensor 27 due to long-term use, and the detected temperature data becomes lower than the actual temperature. In addition to the case of “44 °”, it is necessary to correct the entire temperature correction table LT.

  Therefore, in the present embodiment, based on the contents changed and set in step S18, the correction values at both ends of the set temperature range defined by the temperature correction table LT are fixed without being changed, and the overall characteristic change is smooth. The entire temperature correction table LT is updated and set by executing an interpolation process as follows (step S19).

  FIG. 3 (C) -1 illustrates the contents of the temperature correction table LT after the interpolation processing, and FIG. 3 (C) -2 is a graph of it. As shown by the solid line in the graph of FIG. 3C-2, the interpolation process is performed so that the entire focus adjustment is reflected while reflecting the fine adjustment contents of the user's focus. Can correct the driving position of the focus lens 22a corresponding to the temperature data in the temperature sensor 27 more accurately, and as a result, the influence of deterioration of the temperature sensor 27 and the like are eliminated, and the focus lens over a longer period. Accurate correction based on the temperature at the position 22a can be realized.

  Thus, after the update setting by the interpolation processing of the temperature correction table LT in step S19, the process returns to the standby processing from step S04 again.

  In this way, for example, the fine adjustment operation of the position of the focus lens 22a by the user is reflected in order to compensate for the deterioration of the performance due to the temporal change of the temperature sensor 27 or the decrease in the accuracy of the temperature correction due to other problems in the entire apparatus. Since the contents of the temperature correction table LT are updated and set, it is possible to always maintain an accurate focus state over a long period of time.

  In the above-described embodiment, as described with reference to FIGS. 3C-1 and 2C, with respect to the update setting of the temperature correction table LT, fine adjustment by the user with the correction values at both ends of the set temperature range fixed. Interpolation processing associated with the operation is executed.

  Accordingly, it is possible to easily cope with the case where the correction range is fixed in advance when the temperature of the position of the focus lens 22a is corrected.

  Further, when it is not necessary to fix the correction values at both ends of the set temperature range as described with reference to FIGS. Instead of setting, as shown in FIGS. 4A and 4B, the fine adjustment operation of the position of the focus lens 22a by the user is reflected in the entire temperature correction table LT, and the entire correction value within the set temperature range is uniformly set. It is good also as what shifts to.

  If such update setting is performed, it is not necessary to perform the interpolation processing described in FIGS. 3C-1 and 2 above, and the control unit 28 can update and set the temperature correction table LT more easily. The user's fine adjustment operation can be reflected over the entire set temperature range.

  In the above embodiment, it is determined whether or not the user is performing fine adjustment based on the amount and time of operation of the focus key. If it is determined that fine adjustment is being performed, the amount of operation is immediately determined. Although the temperature correction table LT has been described as being updated and set based on the temperature of the optical lens unit 22 at that time, the present invention is not limited to this. For example, the projection operation is performed by an image signal input to the input / output connector unit 11. And a calibration mode for projecting a focusing position correction test chart image stored in advance in the program memory 29 and accepting a user's fine adjustment operation by operating a mode key, Only when the calibration mode is set, the temperature correction test based on the user's fine adjustment operation. It may be used to perform the update setting of Bull LT.

  In this case, in the calibration mode, as described above, by using a dedicated test chart image suitable for position correction, it is possible to reset the temperature correction content more accurately, and in addition, the operation time and operation amount of the focus key Therefore, it is not necessary for the control unit 28 to determine whether or not the operation is for fine adjustment, and the processing of the control unit 28 particularly in the normal mode can be reduced.

  In addition, since the content of the temperature correction table LT stored in the program memory 29 is not updated and set frequently, the process is executed only when the user himself wants to renew the performance of the apparatus. A calibration operation reflecting the will can be realized.

  Although the above embodiment has been described with respect to a case where the present invention is applied to a DLP (registered trademark) type projector apparatus, the present invention is not limited to this, and a projection apparatus equipped with an automatic focusing function in a projection optical system. If so, a liquid crystal projector device that performs a projection operation using a transmissive color liquid crystal panel as a display element, or a field sequential liquid crystal projector device that transmits a primary color light source to a monochrome liquid crystal display panel in a time-sharing manner. Alternatively, the present invention can be similarly applied to a slide projector, an overhead projector (OHP), or the like.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the functions executed in the above-described embodiments may be combined as appropriate as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination according to a plurality of disclosed structural requirements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect can be obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

1 is a block diagram showing a functional configuration of an electronic circuit of a projector device according to an embodiment of the present invention. 6 is a flowchart showing the processing content related to position correction of the focus lens when the power is turned on according to the embodiment. The figure which illustrates the content of the temperature correction lookup table which concerns on the embodiment, and its transition state. The figure which illustrates other transition states of the contents of the temperature correction look-up table concerning the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Projector apparatus, 11 ... Input / output connector part, 12 ... Input / output interface (I / F), 13 ... Image conversion part, 14 ... Projection process part, 15 ... Video RAM, 16 ... Micromirror element, 17 ... Reflector, DESCRIPTION OF SYMBOLS 18 ... Light source lamp, 19 ... Color wheel, 20 ... Integrator, 21 ... Mirror, 22 ... Optical lens unit, 22a ... Focus lens, 23 ... Stepping motor (M), 24 ... Motor (M), 25 ... Projection light processing part , 26 ... temperature sensor, 27 ... temperature sensor, 28 ... control unit, 29 ... program memory, 30 ... distance measurement processing unit, 31 ... voice processing unit, 32 ... distance measurement sensor, 33 ... speaker, 34 ... key switch unit, 35 ... Ir light receiving unit, LT ... temperature correction look-up table, SB ... system bus.

Claims (6)

A projection unit that forms an optical image using light from a light source, projects the formed optical image by a lens optical system having an automatic focusing function, and forms an image on a projection target surface;
Temperature detecting means for detecting the temperature of the lens optical system of the projection means;
Table storage means for storing a table in which correction values corresponding to the detection results of the temperature detection means are set;
By referring to the table stored in the table storage unit according to the detection result in the temperature detection unit, the specific lens position in the lens optical system of the projection unit is moved by the obtained correction value, and the automatic focusing function is used. Projection control means for correcting the imaging position;
Fine adjustment input means for receiving fine adjustment input of the specific lens position with respect to the imaging position corrected by the projection control means;
A projection apparatus comprising: an updating unit configured to update and set a table stored in the table storage unit in accordance with a fine adjustment input received by the fine adjustment input unit.   2. The update unit according to claim 1, wherein the update unit executes an interpolation process associated with a fine adjustment input received by fixing correction values at both ends of a set temperature range with respect to a table stored in the table storage unit. Projection device.   The projection apparatus according to claim 1, wherein the updating unit uniformly shifts the entire correction value within the set temperature range with the received fine adjustment input with respect to the table stored in the table storage unit. A mode setting means for switching between a mode for performing a normal projection operation and a calibration mode for correcting a specific lens position in the lens optical system of the projection means;
The projection apparatus according to claim 1, wherein the fine adjustment input unit and the update unit are enabled when the calibration mode is set by the mode setting unit. A projection control method for a projection apparatus including a projection unit that forms an optical image using light from a light source, projects the formed optical image by a lens optical system having an automatic focusing function, and forms an image on a projection target surface. There,
A temperature detection step of detecting the temperature of the lens optical system of the projection unit;
A table storage step for storing in advance a table in which correction values corresponding to detection results in the temperature detection step are set;
By referring to the table stored in the table storage step according to the detection result in the temperature detection step, the specific lens position in the lens optical system of the projection unit is moved by the obtained correction value, and the automatic focusing function is used. A projection control step for correcting the imaging position;
A fine adjustment input step of receiving a fine adjustment input of the specific lens position with respect to the imaging position corrected in the projection control step;
A projection control method comprising: an update step of updating and setting the table in accordance with the fine adjustment input received in the fine adjustment input step. A computer built in a projection apparatus including a projection unit that forms an optical image using light from a light source, projects the formed optical image by a lens optical system having an automatic focusing function, and forms an image on a projection target surface Is a program to be executed,
A temperature detecting step for detecting the temperature of the lens optical system of the projection unit;
A table storage step for storing in advance a table in which correction values corresponding to the detection results in the temperature detection step are set;
By referring to the table stored in the table storage step according to the detection result in the temperature detection step, the specific lens position in the lens optical system of the projection unit is moved by the obtained correction value, and the automatic focusing function is used. A projection control step for correcting the imaging position;
A fine adjustment input step for receiving a fine adjustment input of the specific lens position with respect to the imaging position corrected in the projection control step;
A program for causing a computer to execute an update step for updating and setting the table in accordance with the fine adjustment input received in the fine adjustment input step.

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