JP2009098649A - Electronic spectacles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pair of electronic spectacles capable of drastically reducing power consumption when a varifocal lens does not operate and capable of drastically improving battery life. <P>SOLUTION: The pair of electronic spectacles includes: a power source which can start or shut off power supply; a detection switch for detecting the presence or absence of contact to a human body and outputting human body-mounted signal; the varifocal lens which has a plurality of focal distances in accordance with lens driving voltage; a focus switching switch which outputs commands for switching the focal distances of the varifocal lens; a lens driving circuit for applying a lens driving voltage to the varifocal lens in accordance with a focus switching signal commanded by the focus switching switch; and a power source shut-off determinig circuit for shutting off power supply of the power source by using the human body-mounted signal and the focus switching signal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to electronic glasses that electrically switch a focal length.

  As electronic glasses that change the focal length electrically, a variable focus lens that controls the refractive index by enclosing a dielectric material such as liquid crystal in the lens and applying a voltage to it to change the dielectric constant was used. A method has been proposed (see, for example, Patent Document 1).

As a switching control method for electronic glasses, when the user wears electronic glasses, the electrodes provided on the left and right nose pads are in contact with the skin, and the voltage between the electrodes is maintained at a predetermined level for a predetermined time. When detected, the control circuit is activated, and the contact area between the electrode of the pad and the skin is changed by pressing the nose pad with the hand, and when it is detected that the voltage between the electrodes is maintained at a predetermined level for a predetermined time. A method of performing focus switching has been proposed (see, for example, Patent Document 2).
JP-A-11-352445 JP 2007-212501 A

However, in the conventional method, since the electronic circuit is activated by detecting the wearing of the electronic glasses, the operating power of the electronic circuit is always consumed while the electronic glasses are worn regardless of the visual field state of the variable focus lens. ing. However, the variable focus lens does not always need to apply a voltage, and does not apply a voltage in a far field where the focal length is maximum. Therefore, there is a problem that power is consumed because the electronic circuit operates even when viewing a far field of view.
The present invention solves the above-described conventional problems, and an object thereof is to provide electronic glasses that greatly reduce power consumption when a variable focus lens is not operating and greatly improve battery life.

  In order to solve the above-described conventional problems, an electronic spectacle of the present invention includes a power source capable of starting or shutting off power supply, a detection switch for detecting presence or absence of contact with the human body and outputting a human body wearing signal, and a lens A variable focus lens having a plurality of focal lengths according to a driving voltage, a focus switching switch for issuing a command for switching the focal length of the variable focus lens, and a lens according to a focus switching signal commanded by the focus switching switch A lens driving circuit for applying a driving voltage to the variable focus lens; and a power cutoff judgment circuit for cutting off the power supply of the power source using the human body wearing signal and the focus switching signal. It is a feature.

  Further, the electronic glasses of the present invention include a power source capable of starting or shutting off power supply, a detection switch for detecting the presence or absence of contact with the human body and outputting a human body wearing signal, and a plurality of focal points according to the lens driving voltage. A variable focus lens having a distance; a focus switch for issuing a command for switching the focal length of the variable focus lens; and a lens drive voltage to the variable focus lens in accordance with a focus switch signal commanded by the focus switch. A lens driving circuit for applying, a non-input period in which the human body wearing signal is not inputted after the human body wearing signal is inputted, and the lens driving circuit and the power source according to the length of the non-input period And a power cutoff judgment circuit for performing the above control.

  According to the electronic spectacles of the present invention, the power consumption of the electronic spectacles can be reduced, the battery life can be greatly improved, and the number of battery replacement or charging can be reduced.

  Embodiments of a switching control method for electronic glasses according to the present invention will be described below in detail with reference to the drawings.

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of electronic glasses of the present invention. 1L and 3R shown in FIG. 1 are variable focus lenses unique to electronic glasses. These lenses are fixed with frames (4L, 5L and 4R, 5R). This frame is configured to surround the outer periphery of the variable focus lens. The frame is composed of a hinge (8L, 8R) that links a temple (7L, 7R) with an ear hook (not shown) and a frame in the same manner as normal glasses, and a bridge 6 that connects the frames. The butterfly feet (10L, 10R) provided in each frame and the nose pads (9L, 9R) provided at the tips of the butterfly feet. A control block 13 containing an electronic circuit for driving the variable focus lens is attached to the frame 5R.

  The variable focus lens (3L, 3R) is manufactured by bonding a solid lens (1L, 1R) prescribed for power in astigmatism and far vision and a liquid crystal lens (2L, 2R). Since the liquid crystal lens (2L, 2R) encloses liquid crystal, its refractive power changes when a voltage is applied to the liquid crystal. Therefore, when no voltage is applied to the liquid crystal lens, the liquid crystal lens (2L, 2R) is not refracted, and the variable focus lens has a power of only the solid lens (1L, 1R) having a negative power preliminarily prescribed. . In this embodiment, the distance field lens is set.

  In addition, when a voltage is applied to the liquid crystal lens, the liquid crystal lenses (2L, 2R) are refracted into a positive power convex lens. As a result, in combination with the power of the solid lens, the near-field lens having a power suitable for a user reading a book or the like was set.

  Sensors (11L, 11R) are attached to the left and right nose pads (9L, 9R) on surfaces that contact the nose, respectively. The sensors (11L, 11R) are connected to a control block 13 to be described later, and a detection switch 12 using detection signals from the two sensors is configured.

  On the other hand, the frame 5R is provided with a focus changeover switch 14 for switching the refractive power of the liquid crystal lens. The focus changeover switch 14 is connected to a control block 13 described later.

  In the present embodiment, the position of the detection switch 12 is the nose pad, but it may be any part that contacts the human skin. Further, not only those that directly contact the human body, but also vibration sensors that can detect attachment to the human body can be used similarly.

  FIG. 2 is a diagram showing a circuit configuration of the electronic glasses inside the control block 13. Here, the control block 13 includes a battery 15, a power cutoff judgment circuit 16, a lens driving circuit 17 for applying a lens driving pulse to the variable focus lenses (3L, 3R), and a relay 18. A relay 18 is disposed between the battery 15 and the power cutoff judgment circuit 16, and the battery 15 and the relay 18 constitute a power source. This power supply turns on / off the power supply to the power shutoff determination circuit 16 in accordance with the control signals (b, c, d).

  The control signal a connected to the battery 15 is divided into control signals b and c via the focus changeover switch 14 and is connected to the open terminal of the coil 1 of the relay 18 and the power shutoff determination circuit 16 shown in FIG. ing. Further, the control signal d from the power cutoff judgment circuit 16 is connected to the open terminal of the coil 2 of the relay 18 shown in FIG.

  The lens driving circuit 17 can be composed of, for example, a booster circuit and a lens driving pulse generation circuit, and a lens driving pulse is output by a command signal from the power cutoff judgment circuit 16. The focal length of the variable focus lens (3L, 3R) is changed by this lens drive pulse signal. In this embodiment, circuits and elements that operate by receiving power supply from a power source, such as the power cutoff judgment circuit 16 and the lens driving circuit 17, are referred to as electronic circuits.

  The focus change-over switch 14 is a switch for switching between a far field and a near field. In this embodiment, the contact is conducted only while the switch is pressed, and when the switch is released, the contact is disconnected, and the switch position is also restored. The switch of momentary operation to return to is used.

  The sensors (11L, 11R) of the detection switch 12 are wired to the power cutoff judgment circuit 16, respectively. The sensors (11L, 11R) of the detection switch 12 detect wearing / non-wearing of glasses. For example, the state of contact with the human body can be detected by configuring the sensors (11L, 11R) with electrodes, applying a voltage between these electrodes, and measuring the resistance value. That is, when the electronic glasses of the present invention are not put on the face, the resistance between the electrodes becomes high and the wire is disconnected, that is, it can be determined to be in an OFF state (non-wearing). On the other hand, when the electronic glasses of the present invention are put on the face, both electrodes come into contact with the skin of the nose, so that the resistance value between the electrodes decreases. Therefore, it can be determined that the resistance value is lowered to be in an ON state (mounted). A sensor for detecting a human body such as a temperature sensor may be used instead of such an electrode.

  The relay 18 is a latching relay whose two contacts are switched by an input signal. The latching relay keeps its state when a pulse-like signal is given to the coil, and therefore it is not necessary to continue to apply power to the coil, so the power consumption is low. In this embodiment, a winding type latching relay is used. In particular, as a small and light latching relay, an electromagnetic MEMS relay using a mechanical contact is suitable.

  FIG. 3 shows an equivalent circuit of the relay used in this embodiment. The relay includes a plunger for switching an ON contact connected to the battery 15 and an opened OFF contact, a coil 1 for switching the plunger to the ON contact side, and a coil 2 for switching the plunger to the OFF contact side. And a permanent magnet provided between these coils. With this permanent magnet, the contact state can be maintained even if the power of the coil is cut off after the plunger contacts the ON or OFF contact. That is, it functions as a latching relay.

  FIG. 4 shows a detailed block diagram of the power shutdown judgment circuit 16 in the first exemplary embodiment of the present invention. The operation of each block will be described with reference to FIGS.

  In the initial state, power is not supplied to the power cutoff judgment circuit 16. At this time, since the plunger of the relay 18 is in contact with the OFF contact side, the voltage of the battery 15 does not appear at the output terminal of the relay 18. That is, the battery 15 and the power cutoff judgment circuit 16 are in a blocked state.

  In this state, when the focus switching switch 14 is pressed, a voltage is applied to the open terminal of the coil 1 through the control signal b, so that the plunger is switched to the coil 1 side. Therefore, a voltage is supplied from the ON contact to the output terminal via the blanker. As a result, power is supplied to the power cutoff judgment circuit 16.

  At the same time, the signal of the focus changeover switch 14 is applied to the power cutoff judgment circuit 16 through the control signal c. However, since the power cutoff judgment circuit 16 is not supplied with power until the contact of the relay 18 is switched, the control signal d is output. Not. Accordingly, in the initial state, the relay 18 is controlled only by the control signal b.

  The power cutoff judgment circuit 16 includes an A / D converter 19, a comparison circuit 20, and a relay control signal generation circuit 21. While power is being supplied to the power cutoff judgment circuit 16, the relay control signal generation circuit 21 and the comparison circuit 20 monitor the input signals of the focus changeover switch 14 and the detection switch 12, respectively, and according to the state of the input signal. The contact of the relay 18 is switched.

  For example, the input signal of the detection switch 12 is monitored as follows. A voltage is applied to the detection switch 12 from a voltage application circuit (not shown) inside the power cutoff judgment circuit 16, and the output voltage is converted by the A / D converter 19. The converted output voltage is compared with a predetermined threshold voltage by the comparison circuit 20, and a detection signal exceeding the threshold voltage is sent to the relay control signal generation circuit 21. If there is no detection signal, the relay control signal generation circuit 21 determines that the electronic glasses are not worn on the human body, and applies a voltage to the open terminal of the second coil of the relay 18 via the control signal d. As a result, power from the battery 15 to the power cutoff judgment circuit 16 is cut off.

  When the focus change switch 14 is pressed, a voltage is input to the relay control signal generation circuit 21 via the control signal c. As a result, a voltage is applied from the relay control signal generation circuit 21 to the open end of the coil 2 of the relay 18 via the control signal d. As a result, the plunger is attracted to the coil 2 side, the plunger is switched, and the battery 15 and the power cutoff judgment circuit 16 are shut off.

  FIG. 5 is a diagram showing an operation flowchart of the electronic glasses according to the first embodiment of the present invention. The initial state is a state where power is cut off from the battery 15 to the electronic circuit including the power cut-off determination circuit 16.

  From this state, when the focus switching switch 14 is pressed, the voltage of the battery 15 is applied to the open terminal of the coil 1 of the relay 18 via the control signal b, and the flanger is switched to the ON contact side. Therefore, the battery 15 and the power cutoff judgment circuit 16 are connected via the relay 18, and power is supplied to the power cutoff judgment circuit 16 and the lens driving circuit 17.

  When the power cutoff judgment circuit 16 is activated, a voltage is supplied to the sensors (11L, 11R) of the detection switch 12, and the input signal of the detection switch 12 is monitored at regular time intervals. At the same time, the lens driving circuit 17 applies a lens driving pulse having a driving voltage and a driving frequency at which a refractive power suitable for the user's prescription is applied to the liquid crystal lenses (2L and 2R), and the electronic spectacles enter the near-field mode. Transition.

  When the detection switch 12 is in the ON state, it is determined to be mounted, so that power is continuously supplied to the power cut-off determination circuit 16 and the lens drive circuit 17 as it is (maintaining near-field mode). However, when the detection switch 12 is in the OFF state, it is determined that the detection switch 12 is not mounted, so that a pulse is applied from the relay control signal generation circuit 21 to the open terminal of the coil 2 of the relay 18. When applied, the plunger of the relay 18 is switched to the OFF contact side, so that the power supply from the battery 15 to the electronic circuit is cut off.

  Therefore, the monitoring of the input signal of the detection switch 12 by the power cutoff judgment circuit 16 is stopped, and at the same time, the output of the lens drive pulse from the lens drive circuit 17 to the liquid crystal lenses (2L and 2R) is stopped, and the electronic glasses are in the far field mode Migrate to

  On the other hand, when the focus switching switch 14 is pressed while the power shutoff determination circuit 16 is activated, it is determined that the focus is switched, and a pulse is applied from the relay control signal generation circuit 21 to the open terminal of the coil 2 of the relay 18. The Therefore, the plunger in the relay 18 is switched to the OFF contact side, and power supply from the battery 15 to the power cutoff judgment circuit 16 and the lens drive circuit 17 is cut off. As a result, the output of lens driving pulses to the liquid crystal lenses (2L and 2R) stops, and the electronic glasses are switched to the far field mode.

  If the electronic spectacles are removed while the lens driving pulse is being applied to the liquid crystal lenses 2L and 2R, the detection switch 12 is turned off and it is determined that it is not attached. Therefore, the relay control signal generation circuit 21 applies a pulse to the open terminal of the coil 2 of the relay 18, and the plunger in the relay 18 is switched to the OFF contact side. Therefore, the power supply from the battery 15 to the power cutoff judgment circuit 16 and the lens driving circuit 17 is stopped, and the electronic glasses are switched to the far field mode.

  As described above, even when the detection switch 12 for detecting the wearing of the electronic glasses is in the ON state, the power cutoff judgment circuit 16 and the lens driving circuit 17 are disconnected from the battery 15 by the relay 18 unless the focus switch 14 is pressed. Therefore, the battery is not consumed by the standby power of the electronic circuit. Even when the electronic glasses are removed during driving, the power cutoff judgment circuit 16 detects the OFF state of the detection switch 12 and shuts off the power cutoff judgment circuit 16 and the lens driving circuit 17 from the battery 15, so that the electronic circuit The battery consumption due to standby power can be reduced.

  Next, the operation of the electronic spectacles of the present invention will be described for each use situation.

(1) When the electronic glasses are stored, the detection switch 12 is in an OFF state because the sensors (11L, 11R) are open, and the focus changeover switch 14 is also in an OFF state when it is open. Therefore, the relay 18 is in an open state, and the electronic circuit and the battery 15 are disconnected. The liquid crystal lenses (2L, 2R) to which no voltage is applied are in a flat lens state without refractive power, and the combined lenses with the solid lenses 1L, 1R prescribed for the far field, that is, the variable focus lenses (3L, 3R) are , In the far vision state. At this time, there is no power consumption.

(2) When wearing electronic glasses If the electronic glasses are worn on the face from the state of (1) above, the sensors (11L, 11R) of the detection switch 12 come into contact with the nose skin and are turned on. Since the switch 14 is not pressed, power is not supplied to the power cut-off determination circuit 16 so that it does not operate. The liquid crystal lenses (2L, 2R) to which no voltage is applied are in a flat lens state without refractive power, and are combined with a solid lens (1L, 1R) prescribed for a far field, that is, a variable focus lens (3L, 3R). ) Is in the far vision state. Even after wearing, there is no power consumption.

(3) When switching from the far field of view to the near field of view while wearing the electronic glasses When switching from the state (2) to the near field of view, the focus switch 14 is pressed. Then, the contact of the relay 18 is switched, and electric power is supplied from the battery 15 to the electronic circuit. Therefore, the power cutoff judgment circuit 16 and the lens driving circuit 17 are activated and apply a predetermined lens driving pulse to the liquid crystal lenses (2L, 2R). The liquid crystal lens (2L, 2R) functions as a convex lens by applying a lens driving pulse, and the variable focus lens (3L, 3R) is switched to the near field of view by combining with the solid lens (1L, 1R). After switching, power is consumed.

(4) When switching from the near field of view to the far field of view while wearing the electronic glasses When switching from the state (3) to the far field of view again, the focus switch 14 is pressed. Then, a signal enters the power cutoff judgment circuit 16 via the control signal c, and the contact of the relay 18 is switched from the power cutoff judgment circuit 16 via the control signal d. At this time, the connection between the electronic circuit and the battery 15 is interrupted. Therefore, the lens driving pulse supplied to the liquid crystal lens (2L, 2R) supplied from the lens driving circuit 17 is also stopped, so that the variable focus lens (3L, 3R) is switched to the far field. There is no power consumption after switching to the far field of view.

(5) When removing the electronic glasses while in use in the near field of vision When the electronic glasses are removed from the face in the near field of view of (3) above, the sensors (11L and 11R) of the detection switch 12 are detached from the skin of the nose. It will be in the OFF state. Next, the power cutoff judgment circuit 16 that has detected the OFF state switches the contact of the relay 18 and cuts off the connection with the battery 15. Since the lens drive pulse to the liquid crystal lenses (2L, 2R) supplied from the lens drive circuit 17 is also stopped, the variable focus lenses (3L, 3R) are switched to the far field. There is no power consumption after switching to the far field of view. Here, the electronic glasses return to the state (1).

  As described above, according to the present invention, the battery is not consumed during use in the far field of view even when the electronic glasses are worn. In addition, even in a non-wearing state in which the electronic glasses are removed from the face, it is not necessary to supply power from the battery to the electronic circuit to operate the switch, and the battery can be cut off from the electronic circuit, The power consumption of the battery can be greatly reduced. Therefore, it is possible to provide an electronic spectacle that has a long battery life and requires less battery replacement or charging.

  In this embodiment, switching between two focal points has been described, but the power consumption of the battery can be reduced by the same operation even in the case of multi-focal point switching. The difference from the two focal points is that the mode is switched in the order of the far field → the intermediate field → the near field → the far field each time the focus switch 14 is pressed. In addition, when the focal length is automatically switched according to the focal length, the focus switching switch 14 is used as a main power switch.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. The difference from the configuration of the first embodiment is that a timer circuit 22 is provided in the power cutoff judgment circuit 16 and the lens driving circuit 17 can be controlled by the control signal e. Thereby, unnecessary consumption of the battery can be suppressed while shortening the operation time (start-up time) of the electronic glasses when the electronic glasses are removed from the human body for a while and re-mounted.

  FIG. 6 shows a block diagram of the power shutdown judgment circuit 16 in the second exemplary embodiment of the present invention. The power cutoff judgment circuit 16 includes an A / D converter 19, a comparison circuit 20, a timer circuit 22, and a relay control signal generation circuit 21. Further, the timer circuit 22 includes a counter 23 and a cutoff time determination circuit 24. The output of the shut-off time determination circuit 24 is connected to the relay control signal generation circuit 21 and the lens driving circuit 17 and controls these outputs according to the value of the counter 23 described later. The electronic circuit of this embodiment refers to the power cutoff judgment circuit 16 and the lens driving circuit 17.

  Similarly to the first embodiment, a voltage is applied to the detection switch 12 from the power cutoff judgment circuit 16. The detection switch 12 outputs a signal for detecting whether the electronic glasses and the human body are worn or not, and is converted by the A / D converter 19. The converted detection signal is compared with a predetermined threshold voltage by the comparison circuit 20, and only the detection signal exceeding the threshold voltage is sent to the cutoff time determination circuit 24 inside the timer circuit 22.

  The shut-off time determination circuit 24 constantly monitors the detection signal. When it is determined that the detection signal is not sent, it outputs the counter control signal g, starts the counter 23, and starts counting the non-wearing time. To do. The counter 23 sends the count value to the cutoff time determination circuit 24. The shut-off time determination circuit 24 has a plurality of count threshold values therein, and compares these threshold values with the count value sent from the counter 23. The cutoff time determination circuit 24 outputs the lens drive control signal e to the lens drive circuit 17 and the power cutoff signal f to the relay control signal generation circuit 21 according to the comparison result between the count value and a plurality of threshold values ( Details of these will be described later.)

  Although details of the lens driving circuit 17 are not shown, the lens driving circuit 17 can be composed of a booster circuit and a lens driving pulse generation circuit as in the first embodiment. The lens drive pulse is stopped / supplied to the variable focus lens (3L, 3R) by the lens drive control signal e from the cutoff time determination circuit 24. In addition, the relay control signal generation circuit 21 outputs a switching signal for the relay 18 in response to an input signal for the focus changeover switch 14 as in the first embodiment.

  FIG. 7 is a diagram showing an operation flowchart of the electronic glasses according to the second embodiment of the present invention. The operation of the electronic glasses in this embodiment will be described in more detail with reference to FIG.

  The initial state is a state where power is cut off from the battery 15 to the electronic circuit including the power cut-off determination circuit 16. From this state, when the focus changeover switch 14 is pressed, the voltage of the battery 15 is applied to the open terminal of the coil 1 of the relay 18 via the control signal line b, and the flanger is switched to the ON contact side. Therefore, the battery 15 and the power cutoff judgment circuit 16 are connected via the relay 18, and power is supplied to the power cutoff judgment circuit 16 and the lens driving circuit 17.

  When the power shutoff determination circuit 16 is activated, a voltage is supplied to the sensors (11L, 11R) of the detection switch 12, and the input signal of the detection switch 12 is monitored at regular time intervals (1/10 second interval in this embodiment). The cut-off time determination circuit 24 determines the wearing state on the human body. At this time, power is also supplied to the lens driving circuit 17, but no lens driving pulse is output from the cutoff time determination circuit 24 to the lens driving circuit 17 to the liquid crystal lenses (2 L, 2 R). Therefore, the electronic glasses are in the far field mode.

  When the focus switching switch 14 is pressed, if the cutoff time determination circuit 24 determines that electronic glasses are attached to the human body, a lens drive pulse is supplied from the lens drive circuit 17 to the variable focus lens (3L, 3R). And shift to the near vision mode. Next, when the focus changeover switch 14 is pressed, the relay control signal generation circuit 21 determines to switch to the far field mode, and applies a pulse for cutting off the relay 18 through the control signal d to the relay 18. Since the relay 18 is switched to the cut-off state (OFF contact) and the connection with the battery 15 is cut off, the power supply to the power cut-off determination circuit 16 and the lens drive circuit 17 is stopped, and the far-field mode is switched.

  When the focus changeover switch 14 is pressed, when the input signal from the detection switch 12 is not input to the cutoff time determination circuit 24 for a certain time (in this embodiment, 1/2 second), the cutoff time The determination circuit 24 activates the counter 23. Further, when the input signal from the detection switch 12 is input, the cutoff time determination circuit 24 resets the counter 23, that is, stops the count operation, and sets the count value (non-mounting time T) to zero.

  The shut-off time determination circuit 24 includes two threshold values for the count value of the counter 23. The threshold values are the minimum set value (Tmin) and the maximum set value (Tmax), respectively, and Tmin <Tmax. The counter 23 performs counting while the input signal from the detection switch 12 is interrupted, and sends the count value to the cutoff time determination circuit 24.

  When the count value sent from the counter 23 exceeds the minimum set value (Tmin), the cutoff time determination circuit 24 instructs the lens drive circuit 17 to stop the lens drive pulse to the variable focus lens (3L, 3R). A lens drive control signal e is output. Therefore, the electronic glasses automatically enter the far field mode. At this time, the cutoff time determination circuit 24 does not stop the power to the lens driving circuit 17.

  When the input signal from the detection switch 12 is sent to the cutoff time judgment circuit 24 before the count value reaches the maximum set value (Tmax), the cutoff time judgment circuit 24 resets the counter 23 and shuts off. The time determination circuit 24 outputs a lens drive control signal e that instructs the lens drive circuit 17 to send a lens drive pulse to the variable focus lens (3L, 3R). For this reason, the electronic glasses are in a near vision mode.

  When the count value exceeds Tmax, the cutoff time determination circuit 24 outputs a power cutoff signal f that instructs the relay control signal generation circuit 21 to turn off the power. At this time, the relay control signal generation circuit 21 sends a pulse to the relay 18 through the control signal d, so that the relay 18 is turned off (OFF contact). At this time, since the connection between the battery 15 and the electronic circuit is cut off, the power supply to the power cut-off determination circuit 16 and the lens driving circuit 17 is stopped. Since the lens driving pulse to the variable focus lenses 3L and 3R is stopped, the electronic glasses shift to the far field mode.

  As described above, according to the second embodiment of the present invention, even if the spectacles are removed during use, if the set time (Tmax) is satisfied, all the powers will not be turned off, so the use is immediately started. You can resume. Furthermore, battery power can be reduced when the electronic glasses are attached and when the electronic glasses are not attached.

  In this embodiment, two different threshold values for the count value of the counter 23 are prepared, and the power consumption of the electronic circuit is controlled. However, the power supply to the electronic circuit can be controlled more finely by providing a larger number of count value thresholds. By performing such fine control, the power consumption of the battery can be further reduced.

  The electronic glasses according to the present invention are effective as electronic perspective glasses and the like because they have the effect of greatly reducing power consumption and greatly improving battery life. Further, the present invention is useful as electronic glasses or the like having a bifocal function in which a lens is made of a dielectric such as liquid crystal and the refractive index is changed by applying a voltage.

The figure which shows the structure of the electronic spectacles in this invention The figure which shows the circuit structure of the electronic spectacles in the 1st Embodiment of this invention The figure which shows the circuit structure of the relay in the 1st Embodiment of this invention The block diagram of the power-supply-cutoff judgment circuit in the 1st Embodiment of this invention Operation flowchart of electronic glasses in the first embodiment of the present invention The block diagram of the power-supply-cutoff judgment circuit in the 2nd Embodiment of this invention Flowchart of operation of electronic glasses in the second embodiment of the present invention

Explanation of symbols

1L, 1R Solid lens 2L, 2R Liquid crystal lens 3L, 3R Variable focus lens 4L, 4R, 5L, 5R Frame 6 Bridge 7L, 7R Temple 8L, 8R Hinge 9L, 9R Nose pad 10L, 10R Foot 11L, 11R Electrode 12 Detection switch 13 Control block 14 Focus switching switch 15 Battery 16 Power cut-off judgment circuit 17 Lens drive circuit 18 Relay 19 A / D converter 20 Comparison circuit 21 Relay control signal generation circuit 22 Timer circuit 23 Counter 24 Cut-off time judgment circuit

Claims (8)

A power source that can start or shut off the power supply;
A detection switch for detecting the presence or absence of contact with the human body and outputting a human body wearing signal;
A variable focus lens having a plurality of focal lengths according to the lens driving voltage;
A focus switch for issuing a command for switching the focal length of the variable focus lens;
A lens driving circuit for applying a lens driving voltage to the variable focus lens in accordance with a focus switching signal commanded by the focus switch;
Electronic glasses comprising: a power cutoff judgment circuit for shutting off power supply of the power source using the human body wearing signal and the focus switching signal. A power source that can start or shut off the power supply;
A detection switch for detecting the presence or absence of contact with the human body and outputting a human body wearing signal;
A variable focus lens having a plurality of focal lengths according to the lens driving voltage;
A focus switch for issuing a command for switching the focal length of the variable focus lens;
A lens driving circuit for applying a lens driving voltage to the variable focus lens in accordance with a focus switching signal commanded by the focus switch;
A power cutoff judgment circuit for calculating a non-input period in which the human body wearing signal is not inputted after the human body wearing signal is inputted, and controlling the lens driving circuit and the power source according to the length of the non-input period. Electronic glasses equipped with. The electronic spectacles according to claim 1, wherein the variable focus lens has a maximum focal length of the plurality of focal lengths when the lens driving voltage is not applied. The electronic glasses according to claim 1, wherein the focus change-over switch performs a momentary operation. The power cutoff judgment circuit further includes a relay control signal generation circuit,
When the relay control signal generation circuit does not have the human body wearing signal, or when the focus switching signal from the focus changeover switch instructs the maximum focal length of the variable focus lens, it determines that the power supply is shut off, The electronic glasses according to claim 1, wherein a cutoff signal is sent to the power source. The power source is provided with a circuit breaker on the output side of the battery,
The electronic glasses according to claim 1 or 2, wherein the circuit breaker opens and closes power supply from the battery in accordance with a command from the power cut-off circuit or the focus switching switch. The electronic glasses according to claim 6, wherein the circuit breaker functions as a latching relay. The power cutoff judgment circuit further comprises a counter, a cutoff time judgment circuit, and a relay control signal generation circuit,
The cutoff time determination circuit activates the counter when the human body wearing signal is interrupted after the human body wearing signal is input, calculates the non-input period, and the non-input period is set in advance. If it is between the period and the second period, the lens driving circuit is instructed to stop the lens driving voltage, and the relay is applied when the human body wearing signal is interrupted after the second period. The electronic glasses according to claim 2, wherein a command for cutting off the power supply of the power source is sent to the power source to a control signal generation circuit.

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