JP2007133124A - Optical correcting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain observation blur when an observer views an observation object in environment where vibration is strong. <P>SOLUTION: Shake amounts around an X-axis (up and down) and around a Y-axis (right and left) of the observation object α and the observer β are detected by shake amount detection devices 5 and 15. Deviation of the relative position between the observation object α and the observer β is detected based on the shake amounts. By adjusting the angles of a variable angle prism 13 in X-axis and Y-axis directions in a direction where the deviation is restrained, an optical path between the observation object α and the observer β is adjusted. Since the video of the observation object α is sent to the observer β in such a state that it is deviated by an amount equivalent to the deviation of the relative position between the observation object α and the observer β, the observation blur is restrained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical correction apparatus capable of recognizing characters and the like satisfactorily without blurring when reading a magazine or the like in a vibrant environment such as a train.

Conventionally, when an observation target such as a portable display device is used in an environment in which vibration is intense, various methods have been proposed as methods for suppressing the observation blurring of the display content that appears to the observer.
For example, the relative position between the portable display device and the observer is not changed based on the displacement amount of the portable display device and the displacement amount of the head of the observer who is observing the portable display device. The thickness is changed before a method (for example, refer to Patent Document 1) that suppresses the observation blur of the observer by correcting the display position of the image on the portable display device, or the liquid crystal display. Thus, a vari-angle prism capable of moving the optical path up and down is provided, and the vari-angle prism allows the observer to pass through the vari-angle prism by moving the optical path up and down according to the vibration of the liquid crystal display. There has been proposed a method (see, for example, Patent Document 2) in which the displayed display content is viewed as being stationary.
JP-A-10-69266 JP-A-9-190168

However, as described above, the method of correcting the image display position in the portable display device can be applied only to a rewritable display device such as a liquid crystal display device, and the display device cannot be rewritten. Is difficult to apply, and even a display device used for electronic paper is difficult to apply because the frequency of rewriting is low in terms of power consumption.
Further, as described above, the method of suppressing the fluctuation of the display content by correcting the image display position on the portable display device is effective when the observation target is a display device, but the observation target is a newspaper. It cannot be applied to printed matter such as magazines or magazines.

  Further, as described above, in the method using the vari-angle prism, the vibration of the liquid crystal display is detected and the thickness of the vari-angle prism is adjusted accordingly, so that even if the observer is stationary. For example, by adjusting the vari-angle prism, the observer can observe the display content which is almost stationary. However, when both the liquid crystal display and the observer vibrate and the vibration states are different, the display contents of the liquid crystal display may be blurred to the observer.

Further, when the vari-angle prism is provided in the liquid crystal display in this way, the vari-angle prism needs to be large enough to cover the entire display screen of the liquid crystal display, and is used for adjusting the thickness of the vari-angle prism. There is a problem that the power consumption of the mechanism increases.
Therefore, the present invention has been made paying attention to the above-mentioned conventional unsolved problems, and even when the observer and the observation object are moving together and the movement state is different, the observer is An object of the present invention is to provide an optical correction apparatus capable of stably observing an observation object without causing blurring.

  In order to solve the above-described problems, an optical correction apparatus according to the present invention includes an observation target displacement amount detection unit that detects a displacement amount of an observation target, and an observer displacement that detects a displacement amount of an observer who observes the observation target. An optical path adjusting means that is inserted in the vicinity of the observer of the optical path between the observer and the observation object and fluctuates in conjunction with the fluctuation of the observer, Based on the detection signal of the observation object displacement amount detection means and the detection signal of the observer displacement amount detection means, the path adjustment means is based on the displacement of the relative position between the observation object and the observer from the observer. The optical path is adjusted in a direction in which the observed blur of the observed object is suppressed.

  According to the above configuration, the optical path adjustment is performed based on the displacement amount of the observation object detected by the observation object displacement amount detection unit and the displacement amount of the observer who observes the observation object detected by the observer displacement amount detection unit. By adjusting the optical path with the means, the observation blur of the observation object viewed from the observer is suppressed, so even if the movement state of the observer and the observation object is different, the observer selects the observation object. It is possible to observe without causing the observation blur. Further, since the optical path adjusting means is provided in the vicinity of the observer, a mechanism for adjusting the optical path can be realized on a relatively small scale.

  In the optical correction apparatus described above, the optical path adjustment unit includes an optical path angle changing unit capable of changing an optical path angle, a detection signal of the observation target displacement amount detection unit, and a detection signal of the observer displacement amount detection unit. A change amount calculating unit that calculates the change amount of the optical path angle based on the control unit; and a control unit that controls the optical path angle changing unit according to the change amount calculated by the change amount calculating unit.

  According to the above configuration, the change amount calculating means calculates the change amount of the optical path angle of the optical path based on the detection signal of the observation target displacement amount detection means and the detection signal of the observer displacement amount detection means, and corresponds to the calculated change amount. Since the optical path angle of the optical path is changed by controlling the optical path angle changing means so as to change the optical path angle only, according to the occurrence of the observation blur predicted from the amount of displacement between the observation target and the observer The optical path angle can be adjusted accurately, and the observation blur can be suppressed accurately.

The optical correction apparatus includes a distance measuring unit that measures a distance between the observation target and the observer, and the change amount calculating unit includes the detection signal of the observation target displacement detection unit and the observation. The change amount is calculated based on a detection signal from the person displacement amount detection means and a distance measurement value measured by the distance measurement means.
According to the above configuration, based on the distance measurement value between the observation object and the observer measured by the distance measurement means, the detection signal of the observation object displacement amount detection means, and the detection signal of the observer displacement amount detection means. Since the change amount is calculated, a more accurate change amount according to the actual distance between the observation target and the observer can be calculated, and the observation blur can be suppressed more accurately.

Further, in the above optical correction device, the optical path angle changing means is a vari-angle prism capable of changing a thickness of a part of the main body, and the control means is configured to change the vari-angle according to the change amount. It is characterized by changing the thickness of the angle prism.
According to the above configuration, since the optical path angle is changed by the vari-angle prism, the optical path angle can be easily changed.

  Further, in the above-described optical correction device, the observation target filter processing means for extracting a component in a predetermined frequency band set in advance from the detection signal of the observation target displacement detection means, and the detection of the observer displacement detection means An observer filter processing means for extracting a component of the frequency band from the signal, and the optical path adjusting means after the filter processing by the observation object filter processing means and the observer filter processing means. The optical path is adjusted based on each detection signal.

  According to the above configuration, the component of the predetermined frequency band is extracted from the detection signals of the observation object displacement amount detection means and the observer displacement amount detection means by the observation object filter processing means and the observer filter processing means. Since the optical path is adjusted by using the optical path, unnecessary optical path adjustment is avoided based on components in the frequency range where the effects of observation blurring and optical path adjustment cannot be obtained. be able to.

In the optical correction apparatus described above, the lower limit frequency of the frequency band is set to a value corresponding to a frequency at which the observation blur is predicted not to occur.
According to the above configuration, the component corresponding to the frequency that is predicted not to cause observation blur is removed from the detection signal of the observation target displacement detection unit and the detection signal of the observer displacement detection unit. It is possible to avoid unnecessary adjustment of the optical path based on the detection signal that is predicted not to cause blurring.

In the optical correction device described above, the upper limit frequency of the frequency band is set to a value corresponding to a frequency that can be adjusted by the optical path adjustment unit by the optical path adjustment unit.
According to the above configuration, since the component corresponding to the frequency for which the optical path adjustment by the optical path adjustment unit is predicted to be unacceptable is removed, it is predicted that suppression of observation blur is impossible even if the optical path is adjusted. It is possible to avoid unnecessary adjustment of the optical path based on the detected signal.

In the optical correction apparatus described above, the observer displacement amount detection means and the optical path adjustment means are stored in a spectacle-type apparatus main body.
According to the above configuration, the observer can observe the observation object satisfactorily without causing any blurring by simply providing the observation object displacement amount detection means on the observation object and wearing the glasses-type apparatus main body. .

Embodiments of the present invention will be described below.
1 and 2 are block diagrams showing an embodiment of the present invention.
As shown in FIGS. 1 and 2, the optical correction device according to the present invention includes the shake correction optical devices 2 and 3 that are incorporated in the eyeglass-type device body 1 at positions corresponding to the left and right lenses and are configured identically. The shake amount detection device 5 is attached to the observation object α and detects the shake amount, that is, the displacement amount of the observation object α. The shake amount detection device 5 is, for example, a clip or the like. It is configured to be attachable to.

  As shown in FIG. 2, the blur correction optical apparatuses 2 and 3 include two lenses 11 and 12, a vari-angle prism 13 interposed between the lenses 11 and 12, the blur correction optical apparatus 2 and 3 is provided with a shake amount detection device 15 for an observer for detecting the shake amount of the observer β wearing the apparatus main body 1, that is, the displacement amount. The vari-angle prism 13 is a well-known vari-angle prism used in optical image stabilization, and two glasses are joined by a bellows and a high refractive index liquid is filled between the two glasses. By tilting the bellows, the inclination of the two glasses is made variable. And the optical path of incident light changes by changing the inclination of two glasses and changing the inclination of a vari-angle prism. The vari-angle prism 13 is configured to be able to change the angle around the X axis that is the vertical direction and the angle around the Y axis that is the left-right direction when the vari-angle prism 13 is viewed from the front.

Further, the shake amount detection devices 5 and 15 for detecting the shake amount of the observation object α and the shake amount of the observer β are configured to include, for example, a gyro sensor, respectively, in the vertical direction around the X axis and in the horizontal direction. The amount of shake around a certain Y axis can be detected.
FIG. 3 is a block diagram showing the configuration of the blur correction optical apparatuses 2 and 3. Since the blur correction optical apparatuses 2 and 3 are configured identically, the blur correction optical apparatus 2 will be described here.

  As shown in FIG. 3, the shake correction optical device 2 inputs detection signals from the shake amount detection devices 5 and 15 that detect the shake amount of the observation target α and the shake amount of the observer β, and based on these, the observation target The relative position shift amount between α and the observer β is calculated, and from the relative position shift amount, the vari-angle prism 13 of the vari-angle prism 13 is controlled so as to suppress the observation blur when the observer β observes the observation target α. An optical correction control unit 21 that performs angle control, and an X-axis control unit 22 that controls the angle of the vari-angle prism 13 around the X-axis and an angle around the Y-axis are controlled by the optical correction control unit 21. And a Y-axis control unit 23.

  Each of the X-axis control unit 22 and the Y-axis control unit 23 includes a variable amount monitor for detecting how much the angle of the piezoelectric actuator and the vari-angle prism 13 has changed, and controls the voltage applied to the piezoelectric actuator. As a result, the angles of the vari-angle prism 13 around the X-axis and the Y-axis are changed, and the change amount of the angle of the vari-angle prism 13 around the X-axis and the Y-axis is monitored.

  The optical correction control unit 21 receives detection signals from the shake amount detection devices 5 and 15 and controls the X axis of the vari-angle prism 13 so as to suppress observation blur when the observer β observes the observation target α. An optical correction amount calculation unit 21a configured by a CPU or the like that calculates a correction amount, that is, a correction angle around the (vertical direction) and the Y axis (left and right direction), and around the X axis calculated by the optical correction amount calculation unit 21a Based on the correction amount around the Y axis and the amount of change in the angle around the X axis and around the Y axis of the vari-angle prism 13 monitored by the X axis control unit 22 and the Y axis control unit 23, the X axis control unit 22 and a vari-angle prism control circuit 21b that generates and outputs a drive signal to the piezoelectric actuator of the Y-axis control unit 23.

The detection signal of the shake amount detection device 5 for the observation object α may be transmitted wirelessly to the apparatus main body 1 and input to the optical correction control unit 21 or may be input to the optical correction control unit by wire. 21 may be input.
FIG. 4 is a schematic diagram for explaining a correction amount calculation method calculated by the optical correction amount calculation unit 21a.

  As shown in FIG. 4, from the initial state where the eye position of the observer β is Xβ and the observation object α is located at Xα, the eye position of the observer β is moved to Xβ ′ and the observation object α is moved to Xα ′. When the angle control of the vari-angle prism 13 is not performed, the amount of displacement between the observer β and the observation object α is different, and therefore the observation point Q direction that the observer β is gazing at in the initial state is continuously observed by the observer β. Since the image reaches the observer β through the optical path L1 ′, the image of a point different from the observation point Q arrives, and the observation point Q ′ after displacement reaches the observer β through the optical path L2. Although the observer β continues to pay attention to the observation point Q direction, the actually visible image is shifted, and the observation blur where the observation target α appears to be shaken is generated. .

As shown in FIG. 4, in order to deliver the image of the gazing point Q ′ after displacement to the viewer β at the same position as in the initial state while gazing in the gazing point Q direction in the initial state, the optical path L1 The vari-angle prism 13 may correct only the angle θ formed by the optical path L2.
When the variangle prism 13 corrects only the angle θ, as shown in FIG. 5, the image of the gazing point Q ′ that the observer β is gazing at in the initial state is applied to the variangle prism 13 as shown in the optical path L3. Until it enters, it is the same as the optical path L2, but it is corrected by the angle θ by the vari-angle prism 13 and reaches the viewer β. Therefore, the viewer β is gazing in the gazing point Q direction in the initial state. In this state, the image of the gazing point Q ′ continues to arrive, and there is no observation blurring.

Therefore, the correction angle θ is calculated by the following procedure, for example.
Assuming that the position of the observer β in the X-axis direction is Xβ and the position of the observation object α in the X-axis direction is Xα, the distance Lβ between the eye position of the observer β and the vari-angle prism 13 is the vari-angle prism 13 and the observation. Since it is sufficiently smaller than the distance Lα between the objects α, the correction angle θx in the X-axis direction can be calculated by the following equation (1). The correction angle θx represents an angle from the reference state with reference to the inclination in the X-axis direction when the vari-angle prism 13 is in the initial state.

  The distance Lα between the vari-angle prism 13 and the observation object α may be set in advance. That is, when observing a magazine, a newspaper, etc., or a portable display device, the distance between the observer and the observation target is usually determined to some extent. Therefore, this distance may be detected in advance and set as the distance Lα, or a recommended distance may be set as Lα as the distance between the eyes and the book when reading. Alternatively, the distance Lα may be configured to be inputable and may be input by the observer each time. Alternatively, a plurality of distances Lα may be set in advance and can be selected by operating a switch or the like. Also good.

As described above, when the distance Lα is fixed, if the actual distance is different from the set distance Lα, the correct correction is not performed, so there is a possibility that a slight amount of blurring occurs. Since β adjusts the position of the object to be observed so that good observation can be performed, there is no problem.
θx = tan ⁻¹ [(Xα−Xβ) / Lα] (1)
Here, since the distance Lβ between the eye position of the observer β and the vari-angle prism 13 is sufficiently smaller than the distance Lα between the vari-angle prism 13 and the observation object α as described above, FIG. As shown, the shake in the Z-axis direction perpendicular to the X-axis direction can be regarded as hardly contributing to the observation shake of the observer β. Therefore, it is only necessary to correct the shake in the X-axis direction and the Y-axis direction. Note that the amount of blur correction in the Y-axis direction may be calculated in the same procedure as the amount of blur correction in the X-axis direction.

  In the optical correction amount calculation unit 21a, a detection signal from a gyro sensor constituting a shake amount detection device 5 and 15 described later, that is, an angular velocity signal is read, converted into an angle signal, and the gyro sensor is reset. By calculating the cumulative value of the angle from the current inclination around the X axis and the Y axis, and based on this, the observation is based on when the observation object α and the observer β are stationary The current position of the eye part of the person β and the current position of the observation object α are calculated. Further, the gyro sensor is reset by a known procedure and processing such as correction of angular velocity is performed.

Further, the detection signal of the shake amount detection device 5 is input to the left and right shake correction optical devices 2 and 3, respectively, and the above processing is similarly performed in the shake correction optical device 3.
FIG. 6 is a block diagram showing the configuration of the shake amount detection devices 5 and 15. Since the shake amount detection devices 5 and 15 have the same configuration, the shake amount detection device 5 will be described here.
The shake amount detection device 5 includes an X-axis gyro sensor 31 that detects an angular velocity ωx around the X axis (vertical direction), a Y-axis gyro sensor 32 that detects an angular velocity ωy around the Y axis (left and right direction), and sensor signal conversion. Circuit 33. The sensor signal conversion circuit 33 includes a band-pass filter 33a that extracts a predetermined frequency band component from the output signal of the X-axis gyro sensor 31, an amplifier 33b that amplifies the output of the band-pass filter 33a, and a Y-axis gyro. A band-pass filter 33c that extracts a component in a predetermined frequency band set in advance from the output signal of the sensor 32, an amplifier 33d that amplifies the output of the band-pass filter 33c, and the output signals of these amplifiers 33b and 33d are converted into digital signals. And an A / D converter 33e.

Here, the frequency bands of the bandpass filters 33a and 33c are set as follows.
That is, when the frequency of the shake amount detected by the shake amount detection devices 5 and 15 is low, the observation object α and the observer β can be regarded as moving in substantially the same direction. Therefore, the amount of shift in the relative position between the observation object α and the observer β is substantially zero, and it is predicted that no observation blur will occur, and therefore no correction is necessary.

On the other hand, when the frequency of the shake amount detected by the shake amount detection devices 5 and 15 is high to some extent, the correction control of the vari-angle prism 13 cannot follow, and thus correction is impossible. Even if the correction can be made, the observer's eyes do not follow this correction, and there is a possibility that the effect cannot be obtained even if the correction is made.
Therefore, the correction performed based on the amount of blurring is effective even if the low-frequency component corresponding to the frequency at which the possibility of occurrence of observation blur is small and the correction control cannot follow or the correction control is performed. It is necessary to carry out the blurring amount of the frequency in a specific range excluding the high frequency component corresponding to the frequency that is predicted not to be obtained. That is, the band-pass filters 33a and 33c are provided for the purpose of extracting frequency components in the specific range from the respective shake amounts detected by the shake amount detection devices 5 and 15. It is also provided for the purpose of removing low frequency drift components due to temperature, power supply fluctuations, etc. of the shake amount detection devices 5 and 15. Therefore, the frequency band of the bandpass filters 33a and 33c is a frequency at which observation blur is not expected to occur, and the correction control cannot follow from the low frequency corresponding to the low frequency drift component or the effect thereof. Is set to a frequency band up to a high frequency corresponding to a frequency that is predicted not to be obtained.

  Here, the case where the filter processing is performed by the band-pass filters 33a and 33c and then the amplification is performed by the amplifiers 33b and 33d has been described. However, the outputs of the X-axis gyro sensor 31 and the Y-axis gyro sensor 32 are connected to the amplifier 33b. , 33d, and after that, the band pass filters 33a and 33c may perform the filtering process, and then the digital signal may be converted by the A / D converter 33e.

Further, as shown in FIG. 7, instead of the X-axis and Y-axis gyro sensors 31 and 32, an acceleration sensor 31a that detects acceleration in the X-axis direction and an acceleration sensor 32a that detects acceleration in the Y-axis direction are used. Also good.
Next, the operation of the above embodiment will be described.
First, the observer β wears the glasses-type device main body 1. Further, the shake amount detection device 5 is attached to a magazine or the like as the observation object α. Thereby, the shake amount detection device 15 of the apparatus main body 1 detects the shake amount of the observer β, and the shake amount detection device 5 detects the shake amount of the observation target α. The shake amount of the observation object α detected by the shake amount detection device 5 is input to the left and right shake correction optical devices 2 and 3 by wireless or wired communication.

In the shake correction optical devices 2 and 3, a detection signal from the shake amount detection device 5 and a detection signal representing the shake amount of the observer β detected by each shake amount detection device 15 are input, and a correction angle is determined based on this. The vari-angle prisms 13 are calculated and controlled.
For example, when the observer β is in the train and the train is stopped, the observer β and the observation object α are both stationary. In this state, the eye position of the observer β and the observation object α These current positions Xα and Xβ are substantially zero, and the vari-angle prism 13 maintains the initial state.

Therefore, for example, as shown in FIG. 4, when the observer β is gazing at the point Q of the observation target α, the variangle prism 13 maintains the initial state, so the optical path of the gazing point Q is Then, it reaches the observer β without being corrected by the vari-angle prism 13.
From this state, when the train starts and the observer β and the observation object α start to shake, the shake detection devices 5 and 15 detect this shake. The optical correction amount calculation unit 21a calculates the cumulative angle for each of the X axis and Y axis based on the detection signals of the shake amount detection devices 5 and 15, and uses the state in a stationary state as a reference. Then, the current position Xβ of the eye of the observer β and the current position Xα of the observation object α are calculated, and the correction angle is calculated from the equation (1). The vari-angle prism control circuit 21b controls the X-axis control unit 22 and the Y-axis control unit 23 according to the calculated correction angle. As a result, the tilt in the X-axis direction and the tilt in the Y-axis direction of the vari-angle prism 13 change, and the optical path of the gazing point Q with respect to the viewer β changes.

  At this time, when the observer β and the observation object α are displaced in the same manner, the displacement amount of the observer β and the displacement amount of the observation object α are substantially equal, so the correction angle is substantially zero, and the variable angle The angle of the prism 13 does not change. When the observer β and the observation object α are similarly displaced, the gazing point Q is always located in the gazing point Q direction in the observation object α of the observer β. In this case, Even if correction is not performed by the vari-angle prism 13, the observer β can observe the observation object α without causing observation blur.

On the other hand, when the shake amount, that is, the displacement amount between the observer β and the observation object α is different, the position of the gazing point Q is shifted from the gazing point Q direction of the observer β as shown in FIG.
In this case, since a deviation occurs in the relative position between the observer β and the observation object α, the correction angle is calculated according to the equation (1) according to the deviation amount. The inclination of the vari-angle prism 13 in the X-axis direction and the Y-axis direction is controlled according to the correction angle, and the vari-angle prism is set in a direction that suppresses the positional deviation between the gazing point Q direction and the gazing point Q of the observer β. The slope of 13 changes.

For this reason, as shown by the optical path L3 in FIG. 5, the optical path of the gazing point Q is refracted by the vari-angle prism 13, and the image of the gazing point Q reaches the viewer β. Therefore, the direction of the gazing point Q of the observer β coincides with the position of the gazing point Q ′ after the displacement, and the observer β can continue to gaze at the gazing point Q (Q ′), that is, an observation blur occurs. There is nothing.
Thereafter, the vari-angle prism 13 is controlled in accordance with the relative positional deviation between the observer β and the observation object α, and the gazing point Q direction and the gazing point Q ′ of the observer β caused by the relative positional deviation are controlled. Since the inclination of the vari-angle prism 13 is controlled in a direction to suppress the positional deviation, the observer β can observe the observation object α without causing observation blur.

Therefore, even if the observation object α such as a magazine held in the hand of the observer β shakes differently from the shake of the observer β in an environment where the vibration in the train is intense, the observer β observes. It is possible to read a magazine or the like as the observation object α in a state equivalent to a stationary state without blurring.
In particular, when reading a small character such as a magazine, it is very difficult to recognize the character if the observation blur occurs, and this may lead to the eye approaching the magazine or the like, leading to a decrease in visual acuity and the like. However, by using the above optical correction device, it is possible to suppress the blurring of observation, so that even a small character or the like can be accurately recognized, and a reduction in visual acuity can be suppressed.

  Further, in the shake amount detection devices 5 and 15, when the output signals of the gyro sensors 31 and 32 are bandpass filtered, the vibrations are small vibrations that are predicted not to cause observation shake, When it is predicted that shaking due to fluctuations, etc., or even if the vibration is intense and control by the vari-angle prism 13 is observed, the shaking is not detected as the amount of shaking, and thus the fluctuation is unnecessarily detected. It is possible to avoid operating the angle prism 13 and to reduce power consumption accordingly.

  Further, the shake amount detection devices 5 and 15 detect the shake amount by the gyro sensors 31 and 32. Here, when the acceleration sensors 31a and 32a are used as the sensor for detecting the shake amount, as shown in FIG. 7, in order to detect the shake amount, the acceleration that is the output of the acceleration sensor is integrated twice. It is necessary to change in speed and distance. However, when the gyro sensor is used, the shake amount can be detected from the angle by integrating the angular velocity, which is the output of the gyro sensor, once. Compared to the case of using the acceleration sensor that integrates twice. Therefore, it is possible to detect the shake amount with higher accuracy.

In addition, the apparatus main body 1 of the optical correction apparatus is formed in a spectacle shape, and is worn by the observer β. Therefore, it is not necessary for the observer β to hold the optical correction device in his / her hand, and it is effective that the observation blur can be easily suppressed only by wearing this.
In addition, since the observer β wears the apparatus main body 1 and can suppress the observation blur by simply attaching the blur amount detection device 5 to the observation target, the observation target is not limited to a magazine or a newspaper. Even in the case of a portable display device or the like, it is possible to reliably suppress observation blur. In other words, any observation target to which the shake amount detection device 5 can be attached can be favorably observed without causing any observation blur.

  Further, as described above, the blur correction optical devices 2 and 3 are incorporated in the spectacle-type device body 1 and the vari-angle prism 13 only needs to have a size corresponding to a spectacle lens. Compared with the case where a vari-angle prism is mounted on an observation target such as a display device, the size of the vari-angle prism 13 can be remarkably reduced, and power consumption can be reduced correspondingly.

  In the above embodiment, the case where the gyro sensors 31 and 32 and the acceleration sensors 31a and 32a are used as the shake amount detection devices 5 and 15 has been described. However, the present invention is not limited to this. Any means may be used as long as the shake amount of the observer β can be detected. As described above, when the acceleration sensor is used, the acceleration is integrated twice and the position is calculated from the speed, so the accuracy is somewhat lowered. Therefore, the shake amount is calculated using both the acceleration sensor and the gyro sensor. Also good.

In the above embodiment, the case where the distance Lα between the variangle prism 13 and the observation object α is fixed has been described. However, the present invention is not limited to this, and the distance between them is directly measured. It may be configured.
For example, as shown in FIG. 8, a distance sensor (distance measuring means) 40 for detecting a distance Lα between the variangle prism 13 and the observation object α is provided in the vicinity of the variangle prism 13, and the distance sensor 40 detects the distance sensor 40. A correction angle may be calculated using the distance Lα between the vari-angle prism 13 and the observation target α detected by the distance sensor 40 by inputting a signal to the optical correction amount calculation unit 21a. As the distance sensor 40, for example, an infrared sensor or a short distance radio such as a weak radio or a UWB radio can be used.

In the above embodiment, the case where the blur correction optical devices 2 and 3 are provided at positions corresponding to the left and right lenses has been described. However, the present invention is not limited to this.
As described above, the blur amount of the observer β is detected at a position corresponding to the left and right lenses, and the tilt of the left and right vari-angle prisms 13 is adjusted using this to individually detect the left and right eyes of the observer β. For example, in the left and right shake correction optical devices 2 and 3, the shake amount detection device 15 and the optical correction amount calculation unit 21a are used in common, and the correction calculated by the optical correction amount calculation unit 21a is used. The vari-angle prisms 13 provided at the left and right lens positions may be driven and controlled based on the corners. Further, a vari-angle prism 13 having a size that can be viewed with both the left and right eyes may be provided, and may be configured by one blur correction optical device.

In the above-described embodiment, the case where the vari-angle prism 13 is provided and the optical path is changed by this is described. However, the present invention is not limited to this. For example, the optical path is changed by shifting the lens. In other words, any means can be applied as long as the optical path can be changed.
In the above-described embodiment, the case where the apparatus main body 1 is formed into a spectacle type used over both ears has been described. However, the present invention is not limited to this, and for example, the apparatus main body 1 can be formed into a hand-held type spectacle type. Moreover, you may comprise in the shape which can be mounted | worn with spectacles.

Here, in the above embodiment, the gyro sensors 31 and 32 of the shake amount detection device 5 correspond to the observation target displacement amount detection means, and the gyro sensors 31 and 32 of the shake amount detection device 15 serve as the observer displacement amount detection means. Correspondingly, the blur correction optical devices 2 and 3 correspond to the optical path adjusting means.
The vari-angle prism 13 corresponds to the optical path angle changing means, the optical correction amount calculation unit 21a corresponds to the change amount calculation means, and the vari-angle prism control circuit 21b, the X-axis control unit 22, and the Y-axis control unit 23 control. Corresponds to the means.

  Further, the band pass filters 33a and 33c of the shake amount detection device 5 correspond to the observation target filter processing means, and the band pass filters 33a and 33c of the shake amount detection device 15 correspond to the observer filter processing means.

It is an external view which shows embodiment of this invention. It is a block diagram which shows schematic structure of this invention. It is a block diagram which shows the structure of this invention. It is explanatory drawing for demonstrating the calculation method of the correction angle of this invention. It is explanatory drawing for demonstrating the calculation method of the correction angle of this invention. It is a block diagram which shows the structure of a shake amount detection apparatus. It is the other example which shows the structure of a shake amount detection apparatus. It is a block diagram which shows the other example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Apparatus main body, 2, 3 Shake correction optical apparatus, 5 Shake amount detection apparatus for observation objects, 13 Vari angle prism, 15 Shake amount detection apparatus for observers, 21 Optical correction control part, 21a Optical correction amount calculating part, 21b Vari-angle prism control circuit, 22 X-axis control unit, 23 Y-axis control unit, 31, 32 Gyro sensor, 31a, 32a Acceleration sensor, 33 Sensor signal conversion circuit, 33aa, 33c Band pass filter, 40 Distance sensor

Claims (8)

An observation object displacement detection means for detecting the displacement of the observation object;
An observer displacement amount detecting means for detecting a displacement amount of an observer observing the observation object;
An optical path adjusting means that is inserted in the vicinity of the observer of the optical path between the observer and the observation target and fluctuates in conjunction with the fluctuation of the observer,
The optical path adjustment unit is configured to detect the observation according to the displacement of the relative position between the observation target and the observer based on the detection signal of the observation target displacement detection unit and the detection signal of the observer displacement detection unit. An optical correction apparatus that adjusts the optical path in a direction that suppresses the observation blur of the observation object viewed from a person. The optical path adjusting means is an optical path angle changing means capable of changing an optical path angle of the optical path;
A change amount calculation means for calculating a change amount of the optical path angle based on a detection signal of the observation object displacement amount detection means and a detection signal of the observer displacement amount detection means;
The optical correction apparatus according to claim 1, further comprising: a control unit that controls the optical path angle changing unit according to the change amount calculated by the change amount calculating unit. A distance measuring means for measuring a distance between the observation object and the observer;
The change amount calculation means calculates the change amount based on a detection signal of the observation object displacement amount detection means, a detection signal of the observer displacement amount detection means, and a distance measurement value measured by the distance measurement means. The optical correction device according to claim 2. The optical path angle changing means is a vari-angle prism capable of changing the thickness of a part of the main body,
4. The optical correction apparatus according to claim 2, wherein the control unit changes the thickness of the vari-angle prism according to the change amount. Observation target filter processing means for extracting a predetermined frequency band component from a detection signal of the observation target displacement detection means;
An observer filter processing means for extracting the frequency band component from the detection signal of the observer displacement amount detection means,
The optical path adjustment means adjusts the optical path based on each detection signal after the filter processing by the observation object filter processing means and the observer filter processing means. The optical correction apparatus of any one of Claim 4.   6. The optical correction apparatus according to claim 5, wherein a lower limit frequency of the frequency band is set to a value corresponding to a frequency at which the observation blur is predicted not to occur.   7. The optical correction apparatus according to claim 5, wherein the upper limit frequency of the frequency band is set to a value corresponding to a frequency that can be adjusted by the optical path adjustment unit by the optical path adjustment unit.   8. The optical correction apparatus according to claim 1, wherein the observer displacement amount detection unit and the optical path adjustment unit are stored in a spectacle-type apparatus main body. 9.

Images