JP2008142233A - Ophthalmologic imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize the imaging delay time of a fundus camera and the disappearance time of a finder without limiting the types of digital single-lens reflex cameras to be connected. <P>SOLUTION: A delay time T0 of a quick-return mirror of the fundus camera and a remote release delay time T1 of the digital single-lens reflex camera are set and their dimensions are compared. When the delay time T0 is larger, a difference is set in a time difference Ta to actuate the quick-return mirror. When the remote release delay time T1 is larger, the time difference Ta is set similarly, a remote release signal is outputted and after the lapse of the time difference Ta, an X contact signal is turned on. When the X contact signal S2 is turned on, this apparatus confirms the turn-on of a quick-return mirror retreat signal and allows an imaging light source to emit a light. This apparatus restricts a waiting time in a process for waiting the ON of the X contact signal and the quick-return mirror signal, when no signal is inputted during the prescribed time, performs an error process and prevents the imaging light source from emitting a light. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ophthalmologic photographing apparatus such as a fundus camera that is used in an ophthalmic clinic or the like and photographs the fundus of a subject's eye.

  Conventionally, a silver salt film made of an instant film such as a 35 mm film or a polaroid film has been used for fundus photography. In recent years, the resolving power and sensitivity of an image sensor of a digital single-lens reflex camera (single-lens reflex camera) are almost the same as those of a film, and are used by being connected to a fundus camera. For example, Patent Documents 1 to 3 have been proposed as proposals when a digital camera is attached to a fundus camera that is an ophthalmologic photographing apparatus.

  The digital camera disclosed in these documents is a type in which the image pickup element is disposed immediately after the connection part with the fundus camera, and does not have a mechanism unit such as a shutter. Patent Document 4 proposes a connection method when a general-purpose inexpensive digital camera is used for a fundus camera, and a compact digital camera having a shutter and a lens mechanism in front of an image sensor is connected to the fundus camera for photographing. It is disclosed to do.

  Conventionally, when a digital single-lens reflex camera is connected to a fundus camera for shooting, the digital single-lens reflex camera is provided with a remote release terminal for remote shooting from the outside in addition to a release button. When a remote release signal is output during photographing from the fundus camera, the digital single lens reflex camera performs initial operations such as energization processing, initialization, and photometry control for each circuit block, and the focal plane shutter is driven at the strobe synchronization speed.

  When the shutter is opened and the image sensor is ready for exposure, an X contact signal is output from the X contact terminal, and this signal is returned to the fundus camera. The fundus camera waits for the X contact signal and emits the xenon tube while the signal is on to perform fundus photography. When the xenon tube emits light, both the quick return mirror in the fundus camera and the quick return mirror in the digital single-lens reflex camera bounce up and need to be retracted from the photographing optical path.

  Also, the time from the output of the remote release signal to the single-lens reflex camera until the return of the X contact signal varies greatly depending on the model of the single-lens reflex camera, and is about 100 to 250 ms. Since the photographing optical path of the photographer is switched by the quick return mirror of the fundus camera, the photographer cannot observe the fundus while the quick return mirror is being driven. For this reason, the following two methods are adopted for the timing of outputting the remote release signal to the digital single-lens reflex camera.

  (1) The quick return mirror of the fundus camera is driven, and a remote release signal is output after detecting that the mirror has been retracted from the optical path.

  (2) Identify the model of the digital single-lens reflex camera to be used and obtain the remote release delay time in advance.

  The retract time from the optical path of the quick return mirror of the fundus camera, that is, the quick return mirror delay time is measured. When the remote release delay time of a single-lens reflex camera is slower than the delay time of the quick return mirror, the remote release signal is output simultaneously with the shooting switch, and the quick return mirror of the fundus camera is driven after the difference time between the two. Set. Also, the delay time of the quick return mirror of the fundus camera may be slower than the remote release delay time of the single lens reflex camera. In this case, the quick return mirror is driven simultaneously with the photographing switch, and the remote release signal of the single-lens reflex camera is set to be output after the time difference between the two.

JP-A-8-299277 JP-A-10-179523 JP-A-11-313800 JP 2000-107134 A

  In the method (1) described above, the time from when the photographing switch of the fundus camera is pressed to when the photographing light source emits light is the sum of the operation time of the quick return mirror of the fundus camera and the remote release delay time of the digital single lens reflex camera. Therefore, since the imaging delay time from when the imaging switch is pressed until imaging light is obtained is long, the probability of imaging failure due to the eye moving is increased.

  Furthermore, when a plurality of images are continuously photographed, the time during which the fundus cannot be observed from the viewfinder, that is, the viewfinder disappearance time, is increased, which makes it difficult to focus and align. However, there is an advantage that the model of the digital single-lens reflex camera is not specified because it is not affected by variations in the remote release delay time, but it is not effective from the viewpoint of the success rate of shooting and operability.

  FIG. 9 is a timing chart of the conventional example, and T0 is the delay time of the quick return mirror of the fundus camera. T1 is the remote release delay time, T3 is the time from turning off the quick return mirror drive signal to the mirror returning to the return position, T4 is the delay time from pressing the shooting switch until the xenon tube emits light, and T5 is Finder disappearance time. When the photographing switch is pressed (ON), the quick return mirror of the fundus camera is driven (ON). The quick return mirror starts to move from the return position (ON at the observation position) to the retract position (position at the time of photographing), and when the retract position is reached after T0 time, the quick return mirror retract signal is turned ON. At this timing, when a remote release signal is output to the single-lens reflex camera (ON), the X contact signal (ON) returns after T1 time, so that the xenon tube emits light.

  According to this method, even if the delay time of the quick return mirror varies or the remote release delay time varies depending on the model of the digital single-lens reflex camera, there is no problem in the photographing itself. However, there is a problem that the response time (shooting delay time) from when the shooting switch is pressed to when shooting is completed is increased by the sum of the delay times of both.

  In the method (2), there may be a problem when a user connects and uses a digital single-lens reflex camera having a different remote release delay time during use. When a single-lens reflex camera with a slow remote release delay time is connected to a fundus camera that has a remote release delay time shorter than that of the quick return mirror, the X contact signal is delayed after the quick return mirror is retracted from the optical path. Will return. Accordingly, the photographing delay time of the fundus camera is extended, and the finder disappearance time in which the fundus is not visible from the photographer's finder is also extended.

  When a single-lens reflex camera shorter than the remote release delay time T1 is connected, the X contact signal returns before the quick return mirror of the fundus camera retracts from the optical path, and then the quick return mirror of the fundus camera retracts from the optical path. Therefore, the shutter of the single-lens reflex camera is closed when the xenon tube emits light, and photographing fails.

  There are many models of digital single lens reflex cameras, and new models are released every 1 to 2 years, the price is low, and the internal processing is also accelerated, so the remote release delay time tends to be shorter. In a fundus camera in which the types of digital single-lens reflex cameras are limited, there arises an economical problem that the user must have a plurality of digital single-lens reflex cameras for the reserve.

  FIG. 10 is also a timing chart of the conventional example, and the delay time T0 of the quick return mirror of the fundus camera and the remote release delay time T1 of the digital single-lens reflex camera are the same as those described in FIG. When the photographing switch is pressed (ON), the quick return mirror of the fundus camera is driven (ON), and then the remote release is turned on with a delay of Ta = T1-T0. Since the X contact signal is turned on after T1 time and the quick return mirror of the fundus camera is also retracted, the xenon tube is caused to emit light to perform photographing.

  Compared with the method (1), this method has an advantage that the photographing delay time T4 of the xenon tube and the finder disappearance time T5 are shortened. However, this method is limited to the case where the model of the digital single-lens reflex camera is limited. In FIG. 10, when a digital single-lens reflex camera having a remote release delay time T1 shorter than T0-Ta is attached, there is a problem that a quick return mirror is applied to the photographing light flux.

  An object of the present invention is to provide a fundus imaging apparatus that solves the above-described problems and can minimize the imaging delay time of the fundus camera and the disappearance time of the viewfinder without limiting the types of digital single lens reflex cameras that can be connected. It is in.

  The technical features of the ophthalmologic photographing apparatus according to the present invention for achieving the above-described object are: a photographing optical path for guiding a light flux from the eye to be attached to a detachable imaging device; and a light flux of the eye to be examined for observing the eye to be examined. Optical path switching means for switching the observation optical path for observing the image, first delay time acquisition means for acquiring information about the delay time of the optical path switching means, and information acquisition for acquiring information about the imaging apparatus from the imaging apparatus Means, second delay time acquisition means for acquiring information relating to the release delay time of the imaging apparatus corresponding to information relating to the imaging apparatus acquired by the information acquisition means, and acquisition of the first and second delay times An imaging timing adjustment control unit that adjusts the driving timing of the optical path switching unit, the imaging timing of the imaging device, and the emission timing of the imaging light source based on the result of the imaging unit. It lies in the fact that with the door.

  Further, the technical features of the ophthalmologic photographing apparatus according to the present invention include an imaging optical path for guiding the light flux from the eye to be attached to the detachable imaging device, and an observation for guiding the light flux of the eye to be examined to observe the eye to be examined. An optical path switching means for switching between the optical paths, a first delay time acquisition means for acquiring information relating to a delay time of the optical path switching means, and a release delay time of the imaging apparatus by measuring a release delay time of the imaging apparatus. Based on the results of the second delay time acquisition means for acquiring information on the first delay time acquisition means and the first and second delay time acquisition means, the drive timing of the optical path switching means, the imaging timing of the imaging device, and the light emission of the imaging light source A photographing timing adjustment control means for adjusting the timing.

  According to the ophthalmologic photographing apparatus according to the present invention, not only can maintenance and management costs and annoyance be reduced, but even when a fundus camera and a digital single-lens reflex camera are combined, the shortest photographing delay time and the minimum disappearance time of the funda Can be used for fundus photography.

An embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a configuration diagram when a digital single-lens reflex camera is attached to the fundus camera of the first embodiment. A digital single-lens reflex camera 50 as an imaging device is disposed via a camera mount 40 at the rear of the fundus camera 10 that is an ophthalmologic photographing apparatus. In the fundus camera 10, a perforated mirror 12 is provided on the optical path behind the objective lens 11 facing the eye E to be examined. A relay lens 13, a black spot plate 14, a relay lens 15, a ring slit plate 16, a fluorescent exciter filter 17, and a mirror 18 are arranged on the optical path in the incident direction of the perforated mirror 12. Further, in the incident direction of the mirror 18, a condenser lens 19, a photographing light source 20 made of a xenon tube, a condenser lens 21, an observation light source 22 made of a halogen lamp, and a concave mirror 23 are arranged.

  Behind the perforated mirror 12, a focus lens 24, a fluorescent barrier filter 25, an imaging lens 26, a quick return mirror 27, and a digital single lens reflex camera 50 are arranged. A field lens 28, a mirror 29, a focusing screen 30, and a finder lens 31 are arranged on the optical path in the reflection direction of the quick return mirror 27, and these constitute a finder.

  In the digital single-lens reflex camera 50, a quick return mirror 51, a focal plane shutter 52, and a two-dimensional sensor 53 are disposed on the same optical path as the optical path behind the objective lens 11. A pentaprism 54 and an eyepiece 55 are provided in the reflection direction of the quick return mirror 51.

  The fundus camera 10 and the digital single-lens reflex camera 50 are fixed by a detachable mechanism via the camera mount 40 as described above, and the camera mount 40 is provided with an attachment / detachment detection switch 41. If the digital single-lens reflex camera 50 has a common camera mount 40, the optical distance from the camera mount 40 to the two-dimensional sensor 53 is the same.

  The fundus camera 10 includes a fundus camera control circuit 61 and a shooting timing adjustment circuit 62, and an operation rod 64 having a shooting switch 63. The digital single lens reflex camera 50 includes a digital camera control circuit 65. . The imaging light source 20 and the observation light source 22 are connected to outputs of a fundus camera control circuit 61 including an applied voltage control unit. The remote release signal S1 from the fundus camera control circuit 61 is connected to the digital camera control circuit 65, and the X contact signal S2 and the camera information signal S3 from the digital camera control circuit 65 are connected to the fundus camera control circuit 61. The quick return mirror control signal S4 from the fundus camera control circuit 61 is connected to the quick return mirror 27. Further, these signals S1 to S4 are connected to the photographing timing adjustment circuit 62, the output of the photographing timing adjustment circuit 62 is connected to the fundus camera control circuit 61, and the output of the operation rod 64 is the fundus camera control circuit 61, the photographing timing adjustment. The circuit 62 is connected.

  At the time of observation, the observation light source 22 is turned on with a predetermined brightness, and the light beam travels to the left together with the reflected light beam from the concave mirror 23 and is deflected by the mirror 18 through the condenser lenses 21 and 19. Further, the light is condensed and reflected on the perforated mirror 12 through the ring slit plate 16, the relay lens 15, the black spot plate 14, and the relay lens 13, and illuminates the fundus Er through the objective lens 11. The reflected light beam from the fundus Er of the eye E passes through the same optical path, goes right through the central opening of the perforated mirror 12, passes through the focus lens 24 and the imaging lens 26, is reflected by the quick return mirror 27, and is guided to the observation optical path. It is burned. In the observation optical path, the photographer observes the fundus image through the finder lens 31. The photographer adjusts the position of the imaging lens 26 by adjusting the position with the alignment mechanism using the operation rod 64 and adjusting the focus knob.

  At the time of shooting, when the shooting switch 63 on the operation rod 64 is pressed, the observation light source 22 is turned off. At the same time, the quick return mirrors 27 and 51 are raised by the commands of the fundus camera control circuit 61 and the digital camera control circuit 65, the focal plane shutter 52 is opened, and the photographing light source 20 emits light. At the time of fluorescent photographing, the fluorescent exciter filter 17 and the fluorescent barrier filter 25 are inserted into the optical path. The light beam from the imaging light source 20 is collected by the condenser lens 21, travels left, is reflected by the mirror 18, is reflected by the mirror portion of the perforated mirror 12, passes through the objective lens 11, and passes through the pupil of the eye E to be examined. Illuminates the fundus Er.

  The light beam from the fundus Er of the eye E passes through the photographing aperture in the hole of the perforated mirror 12, the focus lens 24, and the imaging lens 26, and passes through the photographing optical path for guiding to the two-dimensional sensor 53 of the digital single lens reflex camera 50. pass. Then, the fundus image data formed on the two-dimensional sensor 53 and obtained by the two-dimensional sensor 53 is subjected to image processing by the digital camera control circuit 65 and converted into image data. It is transferred to a connected PC (personal computer).

  The time from when the drive of the quick return mirror 27 is turned on until the position reaches the photographing optical path side, and the time from when the drive is turned off until the end of the retracting are measured, and the nonvolatile in the photographing timing adjustment circuit 62 is measured. Record it in memory.

  FIG. 2 is a flowchart for measuring the delay time of the quick return mirror. The timer may be a hardware timer in the CPU used in the photographing timing adjustment circuit 62 or may be a timer that processes in software. This measurement operation may be performed every time the power is turned on, or may be performed every period of, for example, about one week, or may be measured every time shooting is performed and the maximum value of the past several times is obtained and updated.

  Since the remote release delay time T1 of the digital single-lens reflex camera 50 is different for each model attached to the fundus camera 10, the model name is information on the type of the digital single-lens reflex camera 50 through the camera information signal S3 from the digital single-lens reflex camera 50. To get. The value of the remote release delay time is acquired by referring to the release delay time information table corresponding to each model stored in the memory of the photographing timing adjustment circuit 62 in advance.

  FIG. 3 is a flowchart for acquiring the model name of the digital single-lens reflex camera 50. Usually, it is acquired at the time of start-up, and after that, when mounting is detected from the attachment / detachment detection switch 41 of the camera mount 40, it is acquired again and the timing is adjusted. Even if the model is the same as the previously installed digital SLR camera, there will be variations due to individual differences, so be sure to readjust. Further, when operating in a system connected to a PC, the PC has model-specific delay time information in advance, obtains model information of the digital single-lens reflex camera 50 that is currently attached to the PC, and a corresponding release delay. The time may be notified to the fundus camera 10.

  Thus, when the delay time of the digital single-lens reflex camera 50 connected to the delay time T0 of the quick return mirror 27 is known, the two are compared to determine the difference. When the shooting switch 63 is pressed during shooting, the one with the later delay time is driven first.

  For example, FIG. 4 is a timing chart when the remote release delay time T1 is later. When the shooting switch signal is input, the remote release is turned on from the information of the shooting timing adjustment circuit 62. The quick return mirror drive signal is turned on with a delay of a time difference Ta obtained by subtracting the quick return mirror delay time T0 from the remote release delay time T1.

  The X contact signal S2 is input after time T1 from the photographing switch signal. At this time, the quick return mirror retracting signal is confirmed, and since the retracting is completed, the photographing light source 20 is caused to emit light. Txe is a delay time from when the X contact signal S2 is inputted to when the photographing light source 20 emits light. After confirming the X contact signal S2, the quick return mirror retract signal is confirmed, and the light emission signal of the photographing light source 20 is obtained. Is the processing time until output. The light emission time is determined by the shape of the photographing light source 20 used for the fundus camera 10 and is usually 5 to 7 ms. When the quick return mirror drive signal is turned OFF after taking this light emission time into consideration, the quick return mirror 27 returns to the return position after time T3, and the photographer can observe the fundus Er.

  FIG. 5 is a flowchart for adjusting and controlling the photographing timing. The delay time T0 of the quick return mirror 27 of the fundus camera 10 and the remote release delay time T1 of the digital single-lens reflex camera 50 are set, and the magnitudes thereof are compared. If the delay time T0 is large, the difference is set to the time difference Ta and the quick return mirror 27 is driven.

  If the remote release delay time T1 is large, the time difference Ta is similarly set, the remote release signal S1 is output, and the X contact signal S2 is turned ON after the time difference Ta has elapsed. When the X contact signal S2 is turned on, the photographing light source 20 emits light after confirming that the quick return mirror retract signal is turned on. In the process of waiting for the X contact signal S2 and the quick return mirror retract signal to be turned on, a waiting time is limited. If no signal is input for a predetermined time, error processing is performed and the photographing light source 20 does not emit light.

  Although not shown in the flowchart, measurement of the delay time T0 of the quick return mirror 27 and the remote release delay time T1 of the digital single-lens reflex camera 50 is also performed simultaneously in this photographing process.

  When the variation in the quick return mirror retract time is slightly extended, the quick return mirror retract signal (2) is delayed as shown in FIG. In such a case, the photographing timing adjustment circuit 62 determines whether or not the light emission time is entered during the time T2 when the X contact is ON. Control to turn off the mirror drive signal.

  Further, in fluorescent photographing, since photographing is performed continuously in a short time, the solenoid that drives the quick return mirror 27 generates heat, the torque is reduced, and the operating speed of the quick return mirror 27 is reduced. In addition, the operating speed is slowed due to aging, wear of the rotating mechanism, and dust adhesion. For this reason, it is preferable to use the longest delay time of photographing about 3 to 5 times. As described above, by adjusting the shooting timing, the shooting delay time T4 and the viewfinder disappearance time T5 can be shortened as compared with the conventional example.

FIG. 6 is a timing chart for another embodiment. The delay time T0 of the quick return mirror 27 of the fundus camera 10 is obtained by any of the methods described above. The shortest value within the range in which the remote release delay time T1 of the digital single-lens reflex camera 50 can be assumed is determined as the time T1, for example, 20 ms. Further, when the fundus camera 10 is activated, the shutter speed of the digital single-lens reflex camera 50 is slowed down from a predetermined speed assumed as a normal light emission synchronization speed by the camera information signal S3. If this delay time is T2, the following relational expression should be satisfied.
T1 + T2 ≧ T0 + Txe + light emission time of the imaging light source 20

Since the delay time Txe from the X contact signal S2 until light emission is a time for checking each signal and processing the light emission signal to the imaging light source 20 as described above, it can be regarded as a constant. Similarly, since the light emission time of the imaging light source 20 is 5 to 7 ms, it can be regarded as a constant, and the delay time T2 can be obtained by the following expression, and the shutter speed may be changed to satisfy this.
T2 ≧ T0 + Txe + light emission time of photographing light source 20−T1

  For example, assuming that Txe = 1 ms, the light emission time of the imaging light source 20 = 7 ms, and T0 = 50 ms, since T1 = 20 ms, the right side is 58 ms−20 ms = 38 ms, and the shutter speed is 1/15 seconds (66.7 ms). Change to

  When the photographing switch 63 is pressed, the quick return mirror 27 and the remote release are turned on. Even if the X contact signal S2 returns at the assumed remote release delay time T1, when the time T0 until the quick return mirror retract signal is turned on is reached, the photographing light source 20 emits light with a delay of time Txe.

  Even if the remote release delay time T1 of the digital single-lens reflex camera 50 is later than expected and the timing of the X contact (2) is reached, the light is normally emitted after the time T0 has elapsed. Further, even if it extends like the timing of the X contact (3), since it is after the delay time T0 of the quick return mirror 27 at this timing, the quick return mirror retract signal is ON, so that the photographing light source 20 emits light. . Control is made to turn off the quick return mirror drive signal after the light emission time has elapsed. At this time, the remote release delay time T1 is measured, and shooting is performed after returning to the normal shutter speed from the next shooting.

  In another embodiment, the remote release signal S1 is sent to the digital single-lens reflex camera 50 when the fundus camera 10 is turned on, and the time until the X contact signal S2 is turned on is measured. At this time, the delay time T0 may be measured by driving the quick return mirror 27 of the fundus camera 10 at the same time. In this sequence, the photographing light source 20 is prevented from emitting light.

  FIG. 7 is a flowchart when the release delay time of the digital single-lens reflex camera 50 is measured. At the same time when the remote release signal S1 is output, the timer is started. When the X contact signal S2 is turned on, the timer is stopped and the remote release delay time T1 is measured.

  In some cases, the remote release delay time T1 of the digital single-lens reflex camera 50 is longer than the delay time T0 of the quick return mirror 27 of the fundus camera 10. In this case, as shown in the timing chart of FIG. 8, the drive time of the quick return mirror 27 is shifted from the photographing switch 63 by Ta = T1-T0.

  When the photographing delay time T4 of this apparatus is a sufficient speed for photographing, the digital single lens reflex camera 50 may be changed to another model. At this time, if the remote release delay time T1 is short and is assumed to be time T1 ′, in the case described above, the time T0 and time T1 ′ are compared, and the slower one is driven first and shifted by the difference. To do.

  However, if the photographer is used to the response of the shooting delay time T4, it may feel difficult to operate sensibly if the timing changes here. At this time, as shown by remote release (2), the remote release delay time is shifted by Tb = T1−T1 ′ by setting the changeover switch (not shown). As a result, the X contact signal S1 has the same timing as that of the digital single-lens reflex camera 50 before the exchange, and photographing can be performed without a sense of incompatibility.

It is a block diagram of an ophthalmologic photographing apparatus. It is a flowchart figure which measures the delay time of a quick return mirror. It is a flowchart figure which acquires a model name. It is a timing chart figure. It is a flowchart figure which adjusts and controls imaging | photography timing. It is a timing chart figure of another Example. It is a flowchart figure which measures release delay time. It is a timing chart figure. It is a timing chart figure of a prior art example. It is a timing chart figure of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fundus camera 11 Objective lens 12 Perforated mirror 20 Imaging light source 22 Observation light source 27, 51 Quick return mirror 31 Viewfinder lens 40 Camera mount 41 Detachment detection switch 50 Digital single-lens reflex camera 53 Two-dimensional sensor 61 Fundus camera control circuit 62 Photographing Timing adjustment circuit 63 Shooting switch 64 Operation rod 65 Digital camera control circuit

Claims (8)

An optical path switching means for switching between an imaging optical path for guiding the light flux from the eye to be attached to the detachable imaging device and an observation optical path for observing the light flux of the eye to be examined;
First delay time acquisition means for acquiring information relating to the delay time of the optical path switching means;
Information acquisition means for acquiring information about the imaging device from the imaging device;
Second delay time acquisition means for acquiring information related to a release delay time of the imaging apparatus corresponding to information about the imaging apparatus acquired by the information acquisition means;
Based on the results of the first and second delay time acquisition means, there is provided an imaging timing adjustment control means for adjusting the drive timing of the optical path switching means, the imaging timing of the imaging device, and the emission timing of the imaging light source. An ophthalmologic photographing apparatus characterized by that.   The ophthalmic imaging apparatus according to claim 1, wherein the information on the imaging apparatus acquired by the information acquisition unit is information on a type of the imaging apparatus.   The ophthalmic imaging apparatus according to claim 1, wherein the second delay time acquisition unit measures a release delay time of the imaging apparatus in response to detection of mounting of the imaging apparatus. An optical path switching means for switching between an imaging optical path for guiding the light flux from the subject's eye to the detachable imaging device and an observation optical path for guiding the luminous flux of the subject's eye to the viewfinder in order to observe the subject's eye;
First delay time acquisition means for acquiring information relating to the delay time of the optical path switching means;
Second delay time acquisition means for acquiring information related to the release delay time of the imaging device by measuring the release delay time of the imaging device;
Based on the results of the first and second delay time acquisition means, there is provided an imaging timing adjustment control means for adjusting the drive timing of the optical path switching means, the imaging timing of the imaging device, and the emission timing of the imaging light source. An ophthalmologic photographing apparatus characterized by that.   The ophthalmologic photographing apparatus according to claim 4, wherein the second delay time acquisition unit performs photographing without emitting the photographing light source and measures the delay time.   5. The second delay time acquisition unit performs shooting by setting a shutter speed of the imaging device slower than that during normal shooting at startup, and measures a release delay time of the imaging device. The ophthalmologic photographing apparatus described in 1.   The photographing timing adjustment control means starts driving sequentially from the one with the long delay time among the ones acquired by the first and second delay time acquisition means, and shifts the drive start time by the difference between the delay times. The ophthalmologic photographing apparatus according to claim 1 or 4, characterized in that:   The imaging timing adjustment control means adjusts the release timing of the imaging device to make the emission timing of the imaging light source the same as before the change when the release delay time changes in a short direction. The ophthalmologic photographing apparatus according to claim 1 or 4.

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