Patent Description:
Conventionally, there is a known component mounting device provided with a load cell between a suction nozzle and a linear motor that lowers the suction nozzle, and that determines that a component was damaged when a counterforce detected by the load cell decreases rapidly when the suction nozzle contacts the component during pickup or when the component held by the suction nozzle contacts a mounting target (for example, refer to patent literature <NUM>).

Patent literature <NUM> and Patent literature <NUM> provide further die mounting devices according to the prior art.

With patent literature <NUM> above, although it is disclosed to determine whether a component was damaged based on a counterforce detected by a load cell when picking up a thin component with a suction nozzle, there is no disclosure of determining whether a die has broken when peeling the die from a sheet to which a wafer divided into multiple dies is affixed.

An object of the present invention is to appropriately determine whether a die has broken when peeling the die from a sheet to which a wafer divided into multiple dies is affixed. Solution to Problem.

The present invention uses the following means to achieve the above object.

A die mounting device of the present invention is a die mounting device configured to pick up a die from a sheet to which a wafer divided into multiple dies is affixed using a nozzle and mount the die on a target object, the die mounting device including: a board conveyance device for loading and fixing the target object at a mounting position, a tape supply device comprising a reel around which a tape for supplying components to the mounting device is wound; a head including the nozzle configured to be raised and lowered and to pick up die from the sheet or a component supplied from tape supply device; a peeling device configured to peel the die from the sheet by pushing the die to be picked up by the nozzle from underneath the sheet using a pusher pin; a component camera provided between the board conveyance device and the tape supply device and configured to image a die held by suction nozzle when suction nozzle holding the die passes above component camera and to output the image to the control device; a load measuring section configured to measure a load applied to the nozzle or the pusher pin; and a control section configured to control the head and the peeling device such that the die is picked up by the nozzle by being peeled from the sheet with the pusher pin pushing the die from underneath the sheet in a state with the nozzle contacting the die, and determine whether the die has broken based on the load measured by the load measuring section when the die is pushed up by the pusher pin wherein the control device is configured to, when determining that the die has broken, control the mounting head to pick up the die using the nozzle and discard the die to a specified discard location remote of the peeling device on a path that avoids going above component camera and target object.

A die mounting device of the present invention is configured to pick up a die from a sheet to which a wafer divided into multiple dies is affixed using a nozzle and mount the die on a target object, and is provided with a head, a peeling device, a load measuring section, and a control section. The control device controls the head and the peeling device such that the die is picked up by the nozzle by being peeled from the sheet with the pusher pin pushing the die from underneath the sheet in a state with the nozzle contacting the die, and determines whether the die has broken based on the load measured by the load measuring section when the die is pushed up by the pusher pin. Thus, it is possible to quickly and appropriately determine if a die has broken when being picked up from the wafer. Thin dies affixed to a sheet break easily because they bend when pushed by the pusher pin. If such a die breaks, tiny fragments are created that may have a negative effect on surrounding dies. Therefore, with the die mounting device, by quickly determining whether a die has broken, appropriate measures can be taken and any negative effects are minimized.

In a die mounting device which does not form part of the present invention, the control device may be configured to, when determining that the die has broken, control the mounting head to return the die to its original position on the sheet. With a die mounting device of the present invention, the control device is configured to, when determining that the die has broken, control the
mounting head to pick up the die using the nozzle and discard the die to a specified discard location. This prevents fragments created by the die breaking from falling onto a target object or the like.

Also, with a die mounting device of the present invention, the control device may be configured to control the peeling device and the head such that the die is peeled from the sheet by the peeling device and picked up by the nozzle based on the load measured by the load measuring section, or control the head such that the die picked up by the nozzle is mounted on the target object based on the load measured by the load measuring section. In this manner, the die mounting device does not have to be provided with a dedicated load measuring section to determine whether the die has broken.

Embodiments of the present invention are described below with reference to the figures.

<FIG> shows the overall configuration of component mounting system <NUM>; <FIG> shows the overall configuration of mounting head <NUM>; <FIG> is a block diagram showing electrical connections of mounting system <NUM>. Note that, in <FIG>, the left-right direction is the X-axis direction, the front-rear direction is the Y-axis direction, and the up-down direction is the Z-axis direction.

As shown in <FIG>, component mounting system <NUM> is a system for mounting a component such as dies D divided on wafer W onto a target object (board S, another component, or the like), and is provided with component mounting device <NUM> and management computer (PC) <NUM>. In component mounting system <NUM>, multiple component mounting devices <NUM> that mount components on board S are arranged in a line from upstream to downstream. For convenience of description, <FIG> only shows one component mounting device <NUM>. Note that, component mounting system <NUM> may also be provided with items such as a solder printer, inspection machine, and reflow oven in the same mounting line as component mounting device <NUM>.

Component mounting device <NUM> is provided with board conveyance device <NUM>, mounting head <NUM>, head moving device <NUM>, suction nozzle <NUM>, component camera <NUM>, mark camera <NUM>, discard box <NUM>, tape supply device <NUM>, wafer supply device <NUM>, and control device <NUM>. Board conveyance device <NUM> loads board S, conveys board S, fixes board S at a mounting position, and unloads board S. Board conveyance device <NUM> includes a pair of conveyor belts provided extending in a left-right direction and separated in the front-rear direction of <FIG>. Board S is conveyed by these conveyor belts.

Mounting head <NUM> is for picking up die D supplied from wafer supply device <NUM> or a component supplied from tape supply device <NUM> and mounting it on board S fixed by board conveyance device <NUM>, and is moved in XY-axis directions by head moving device <NUM>. Head moving device <NUM> is provided with sliders loaded on guide rails so as to slide in XY-axis directions, motors for driving the sliders, and position sensors for detecting the position of the sliders in the XY-axis directions.

As shown in <FIG>, mounting head <NUM> is provided with head main body <NUM>, suction nozzle <NUM>, rotation device <NUM>, and raising and lowering device <NUM>. At least one nozzle holder <NUM> is attached to mounting head <NUM> and suction nozzle <NUM> is removably attached to the lower end of nozzle holder <NUM>. Suction nozzle <NUM> is attached to be movable in an up-down direction (Z-axis direction) with respect to nozzle holder <NUM>. A compression spring, not shown, is built into nozzle holder <NUM> and suction nozzle <NUM> is biased upwards with respect to nozzle holder <NUM> by the biasing force of the compression spring. Rotation device <NUM> is provided with rotation motor <NUM> with gear <NUM> provided on rotation shaft thereof, and a rotation position sensor for detecting the rotation position of rotation motor <NUM>. Gear <NUM> that engages with gear <NUM> is provided on the top end of nozzle holder <NUM>, and nozzle holder <NUM> is movable in the Z-axis direction with respect to gear <NUM>. Mounting head <NUM> can freely adjust the angle of nozzle holder <NUM> by driving rotation motor <NUM>. Suction nozzle <NUM> is attached to nozzle holder <NUM>, and mounting head <NUM> can adjust the angle of a component held by suction nozzle <NUM> by adjusting the angle of nozzle holder <NUM>.

Raising and lowering device <NUM> is provided with first raising and lowering device <NUM>, second raising and lowering device <NUM>, and load cell <NUM> (load measuring section). First raising and lowering device <NUM> is provided with first linear motor <NUM>, first Z-axis slider <NUM> capable being raised and lowered in the Z-axis direction by the driving of first linear motor <NUM>, and first Z-axis position sensor <NUM> that detects the position of first Z-axis slider <NUM> in the Z-axis direction. First engaging section 53a that can engage with (contact) horizontal section <NUM> provided on nozzle holder <NUM> is formed on first Z-axis slider <NUM>. Therefore, suction nozzle <NUM> attached to nozzle holder <NUM> can be raised and lowered in accordance with the raising and lowering of first Z-axis slider <NUM>.

Second raising and lowering device <NUM> is provided with second linear motor <NUM> attached to first Z-axis slider <NUM> of first raising and lowering device <NUM>, and second Z-axis slider <NUM> that can be raised and lowered by the driving of second linear motor <NUM>. Second engaging section 57a that can engage with (contact) an upper surface of flange section 24a that extends in a diameter direction at an upper section of suction nozzle <NUM> is formed on second Z-axis slider <NUM>. Therefore, suction nozzle <NUM> can be raised and lowered in accordance with the raising and lowering of second Z-axis slider <NUM>. In the present embodiment, the stroke distance of second Z-axis slider <NUM> by second raising and lowering device <NUM> is shorter than the stroke distance of first Z-axis slider <NUM> by first raising and lowering device <NUM>. Raising and lowering device <NUM>, after roughly adjusting the Z-axis position of suction nozzle <NUM> using first raising and lowering device <NUM>, finely adjusts the Z-axis position of suction nozzle <NUM> using second raising and lowering device <NUM>. Also, load cell <NUM> for detecting load F applied to suction nozzle <NUM> when suction nozzle <NUM> picks up a component is provided on second Z-axis slider <NUM>.

The suction opening of suction nozzle <NUM> is connected to a negative pressure source and a positive pressure source via switching valve <NUM> (electromagnetic valve), and by driving switching valve <NUM> a component is picked up by negative pressure being supplied to the suction opening and the component is released by applying positive pressure to the suction opening.

Component camera <NUM> is provided between board conveyance device <NUM> and tape supply device <NUM>. Component camera <NUM> images a component held by suction nozzle <NUM> when suction nozzle <NUM> holding the component passes above component camera <NUM>, and outputs the image to control device <NUM>.

Mark camera <NUM> is provided on head moving device <NUM> to be movable in XY-axis directions. Mark camera <NUM> images from above positioning reference marks provided on board S for recognizing the position of board S as it is conveyed, and outputs an image of the reference marks to control device <NUM>. Also, mark camera <NUM> images from above wafer W that includes dies D to be picked up by mounting head <NUM>, and sends the image to control device <NUM>.

Discard box <NUM> is provided between board conveyance device <NUM> and tape supply device <NUM>. Discard box <NUM> is a box to which components for which a pickup error or a mounting error occurred are discarded.

Tape supply device <NUM> is provided with a reel around which tape storing components is wound, and supplies components to component mounting device <NUM> by pulling the tape from the reel.

Wafer supply device <NUM> is for supplying dies D divided on wafer W to a pickup position of mounting head <NUM> and is provided with wafer pallet <NUM>, magazine <NUM>, and die peeling device <NUM>. Die sheet <NUM> to which wafer W is affixed is attached to wafer pallet <NUM> in a stretched state. Multiple wafer pallets <NUM> are stored in magazine <NUM>, and a wafer pallet <NUM> is pulled out from magazine <NUM> by pallet removal device <NUM> when die D is to be picked up by mounting head <NUM>.

Die peeling device <NUM> is provided with pot <NUM>, pot moving device <NUM>, pusher pin <NUM> (pushing section), and raising and lowering device <NUM>. Pot <NUM> is arranged below wafer pallet <NUM> removed by pallet removal device <NUM>, and is movable in the XY-axis directions via pot moving device <NUM>. Pot moving device <NUM> is provided with sliders loaded on guide rails so as to slide in XY-axis directions, motors for driving the sliders, and position sensors for detecting the position of the sliders in the XY-axis directions. Pusher pin <NUM> is arranged inside pot <NUM> and is for pushing up die D from underneath die sheet <NUM>, the die D being the die D to be picked up among the dies D divided on wafer W affixed to die sheet <NUM>. Multiple types of pusher pins <NUM> of a different quantity and size are provided in accordance with the size of die D. Die peeling device <NUM> is provided with multiple pots <NUM> that include different types of pusher pins <NUM>, and by selecting a pot <NUM> in accordance with the size of the die D, the die can be pushed. A suction opening is provided on an upper surface of pot <NUM>, and die peeling device <NUM> is able to push up and peel only the die D to be picked up die sheet <NUM> by pusher pin <NUM> pushing up the die in a state with the upper surface of pot <NUM> suctioning and supporting die sheet <NUM>.

Raising and lowering device <NUM> is configured to raise and lower pot <NUM> and pusher pin <NUM>, and when the upper surface of pot <NUM> approaches a position just about contacting die sheet <NUM>, the raising of pot <NUM> is stopped by a stopper mechanism, which is not shown, then, pusher pin <NUM> protrudes from the upper surface of pot <NUM>, and die D is pushed from underneath die sheet <NUM>.

Control device <NUM> is configured from a microprocessor built around a CPU, and is provided with ROM, RAM, an input and output board, and the like. As shown in <FIG>, control device <NUM> receives signals from mounting head <NUM> (first Z position sensor <NUM>, and second Z-axis position sensor <NUM>, load cell <NUM>, and a rotation position sensor), head moving device <NUM> (position sensor), component camera <NUM>, mark camera <NUM>, tape supply device <NUM>, pallet removal device <NUM>, and die peeling device <NUM> (Z-axis position sensor <NUM>) via an input port. Also, control device <NUM> outputs signals to board conveyance device <NUM>, mounting head <NUM> (first raising and lowering device <NUM>, second raising and lowering device <NUM>, rotation device <NUM>, switching valve <NUM>), component camera <NUM>, mark camera <NUM>, tape supply device <NUM>, pallet removal device <NUM>, and die peeling device <NUM> (pot moving device <NUM> and raising and lowering device <NUM>) via an output port.

Management PC <NUM> is connected to control device <NUM> such that communication is possible and manages items such as job information. Job information includes, for example, the mounting order of components, the sizes and types of components to be mounted, devices to be used, the size of board S, the production quantity, and so on.

Next, operation of component mounting system <NUM> of an example that is useful for understanding the invention and is configured as above is described, in particular, operation of picking up a die D from wafer W and mounting the die D on a target object. <FIG> and <FIG> are flowcharts showing an example of die mounting processing performed by control device <NUM>. This processing is performed when a production command including job information is received from management PC <NUM>.

With die mounting processing, control device <NUM>, first, performs drive control of head moving device <NUM> such that suction nozzle <NUM> is moved directly above the die D (target die) to be picked up (step S100). Next, control device <NUM> performs drive control of first raising and lowering device <NUM> to lower suction nozzle <NUM> at high speed (step S110). Further, control device <NUM> determines whether the position of suction nozzle <NUM> in the Z-axis direction identified based on signals from first Z-axis position sensor <NUM> and second Z-axis position sensor <NUM> has reached specified position P1 (step S120). Here, specified position P1 is defined as a position a specified distance before suction nozzle <NUM> contacts die D.

Control device <NUM>, if determining that the position of suction nozzle <NUM> has not reached specified position P1, continues lowering suction nozzle <NUM> using first raising and lowering device <NUM>, and if determining that the position of suction nozzle <NUM> has reached specified position P1, stops driving first raising and lowering device <NUM> (step S130) and further lowers suction nozzle <NUM> at low speed by performing drive control of second raising and lowering device <NUM> (step S140). Then, control device <NUM> determines whether suction nozzle <NUM> has contacted the target die (step S150). This processing, for example, may be performed by determining whether load F applied to suction nozzle <NUM> that is detected by load cell <NUM> exceeds a specified load. Control device <NUM>, if determining that suction nozzle <NUM> has not contacted the target die, continues lowering suction nozzle <NUM>, and if determining that suction nozzle <NUM> has contacted the target die, performs drive control of switching valve <NUM> to supply negative pressure to the suction opening of suction nozzle <NUM> (step S160) and then performs drive control of raising and lowering device <NUM> of due peeling device <NUM> to push up the target die from underneath die sheet <NUM> (step S170). Then, control device <NUM> continues drive control of second raising and lowering device <NUM> using feedback control such that load F applied to suction nozzle <NUM> remains at target load F1 (step S180), determines whether load F decreases rapidly (step S190), then determines whether the pushing of the target die is complete and whether peeling of the target die is complete (step S200). Here, the processing of step S190 is to determine whether the target die has broken due to pushing of the target die by pusher pin <NUM> and is performed, for example, by determining whether an absolute value of the reduction amount in load F in a given period of time has exceeded a specified amount.

Control device <NUM>, if determining that load F applied to suction nozzle <NUM> before completion of pushing of the target die by pusher pin <NUM> has decreased rapidly, determines that the target die has been damaged, then performs drive control of raising and lowering device <NUM> of die peeling device <NUM> to lower pusher pin <NUM> (step S210), and performs drive control of second raising and lowering device <NUM> to lower suction nozzle <NUM> (step S220). Then, control device <NUM> returns the target die to its original position on die sheet <NUM> by performing drive control of switching valve <NUM> to supply positive pressure to the suction opening of suction nozzle <NUM> (step S230), then ends processing.

On the other hand, control device <NUM>, if determining that pushing of the target die by pusher pin <NUM> is complete without load F applied to suction nozzle <NUM> decreasing rapidly, performs drive control of first raising and lowering device <NUM> and second raising and lowering device <NUM> to raise suction nozzle <NUM> and pick up the target die (step S240). Next, control device <NUM> moves the target die held by suction nozzle <NUM> above component camera <NUM>, captures an image using component camera <NUM> (step S250), processes the acquired image, and corrects the target mounting position on board S (step <NUM>). Then, control device <NUM> performs drive control of head moving device <NUM> to move the target die held by suction nozzle <NUM> directly above the target mounting position (step S270) and performs drive control of first raising and lowering device <NUM> to lower suction nozzle <NUM> at high speed (step S280). Next, control device <NUM> determines whether the position of suction nozzle <NUM> in the Z-axis direction has reached specified position P2 (step <NUM>). Here, specified position P2 is defined as a position a specified distance before the target die held by suction nozzle <NUM> contacts board S. Control device <NUM>, if determining that the position of suction nozzle <NUM> has not reached specified position P2, continues lowering suction nozzle <NUM> using first raising and lowering device <NUM>, and if determining that the position of suction nozzle <NUM> has reached specified position P2, stops driving first raising and lowering device <NUM> (step S300) and further lowers suction nozzle <NUM> at low speed by performing drive control of second raising and lowering device <NUM> (step S310). Then, control device <NUM> determines whether the target die held by suction nozzle <NUM> has contacted board S (step S320). This processing, for example, similar to step S150, may be performed by determining whether load F applied to suction nozzle <NUM> exceeds a specified load. Control device <NUM>, if determining that the target die has not contacted board S, continues lowering suction nozzle <NUM> using second raising and lowering device <NUM>, and if determining that the target die has contacted board S, performs drive control of second raising and lowering device <NUM> using feedback control such that load F applied to suction nozzle <NUM> is target load F2 (step S330), and determines whether load F is substantially equal to target load F2 (step S340). Here, target load F2 is defined as an appropriate pushing load for mounting the target die on board S. Then, control device <NUM>, if determining that load F is substantially equal to target load F2, performs drive control of switching valve <NUM> to supply positive pressure to the suction opening of suction nozzle <NUM> such that the target die is mounted on board S (step S350), then ends processing.

<FIG> illustrates states during pickup by suction nozzle <NUM> of die D affixed to die sheet <NUM>. Control device <NUM> performs drive control of second raising and lowering device <NUM> of mounting head <NUM> such that suction nozzle <NUM> contacts die D, and performs drive control of raising and lowering device <NUM> of die peeling device <NUM> such that die D is pushed from underneath die sheet <NUM> by pusher pin <NUM> (refer to <FIG>). Control device <NUM>, while die D is being pushed up by pusher pin <NUM>, performs drive control of second raising and lowering device <NUM> using feedback control such that load F applied to suction nozzle <NUM> is target load F1, thereby ensuring that an excessive force is not applied to die D (refer to f<FIG>). Next, control device <NUM>, when pushing up by pusher pin <NUM> has been completed and die D has been peeled from die sheet <NUM> (refer to <FIG>), suction nozzle <NUM> is raised and the peeled die D is picked up (refer to <FIG>).

<FIG> illustrates states of a countermeasure, which is not an embodiment of the present invention, when a component being picked up by suction nozzle <NUM> breaks. Control device <NUM>, if determining that load F applied to suction nozzle <NUM> decreased rapidly while die D was being pushed up by pusher pin <NUM> (refer to <FIG>and <FIG>), determines that die D broke (refer to <FIG>. In this case, control device <NUM> performs drive control of raising and lowering device <NUM> to lower pusher pin <NUM> and performs drive control of second raising and lowering device <NUM> to lower suction nozzle <NUM> so as to return the broken die D to its original position on die sheet <NUM> (refer to <FIG>and <FIG>). Thus, by not picking up a broken die D with suction nozzle <NUM>, tiny fragments created by the broken die D do not fall in various locations inside component mounting device <NUM>.

Correspondences between main constituent elements of the embodiments and main constituent elements of the invention will be clarified here. Component mounting device <NUM> corresponds to a "die mounting device", suction nozzle <NUM> corresponds to a "nozzle", mounting head <NUM> corresponds to a "head", die peeling device <NUM> corresponds to a "peeling device", load cell <NUM> corresponds to a "load measuring section", and control device <NUM> corresponds to a "control device".

Component mounting device <NUM> of an embodiment described above uses suction nozzle <NUM> to pick up a die D that is a target for pickup from among dies D affixed to die sheet <NUM> while the die D is being pushed up from underneath die sheet <NUM> by pusher pin <NUM>. Also, component mounting device <NUM> is provided with load cell <NUM> for detecting a load applied to suction nozzle <NUM>, and determines whether die D has broken based on a change in the load F applied to suction nozzle <NUM> when die D is pushed up by pusher pin <NUM> in a state with suction nozzle <NUM> contacting die D. Thus, it is possible to quickly and appropriately determine whether die D has broken using load cell <NUM>.

Further, component mounting device <NUM>, if determining that die D has broken, lowers pusher pin <NUM> and lowers suction nozzle <NUM>, and supplies positive pressure to the suction opening of suction nozzle <NUM> such that broken die D is returned to its original position on die sheet <NUM>. Thus, tiny fragments of broken die D do not fall in various locations inside component mounting device <NUM>.

Meanwhile, it goes without saying that the invention is not limited to the above-mentioned embodiments and various embodiments may be applied within the technical scope of the invention.

For example, in a case that is not an embodiment of the present invention, in which die D pushed up by pusher pin <NUM> breaks, the broken die D is returned to its original position on die sheet <NUM>. In accordance with embodiments of the present invention, the broken die D is picked up by suction nozzle <NUM> and discarded in discard box <NUM>. <FIG> is a flowchart showing die mounting processing (former portion) of an alternative embodiment. The latter portion of the die mounting processing of the alternative embodiment is the same as that shown in the flowchart of <FIG>, so a separate flowchart is omitted. Note that, for processing of each step of the die mounting processing of <FIG> that is the same as the die mounting processing of <FIG>, the same step numbers are used and descriptions are omitted. Also, the latter portion of the die mounting processing of the alternative embodiment is the same as that shown in the flowchart of <FIG>, so a separate flowchart is omitted.

In the die mounting processing of <FIG>, control device <NUM>, if determining that die D has broken because load F applied to suction nozzle <NUM> has decreased rapidly in step S190, performs drive control of first raising and lowering device <NUM> and second raising and lowering device <NUM> such that the broken die D remains held by suction nozzle <NUM> and suction nozzle <NUM> is raised (step S210B). Then, control device <NUM> performs drive control of head moving device <NUM> such that suction nozzle <NUM> is moved directly above discard box <NUM> (step S220B), drops the broken die D held by suction nozzle <NUM> into discard box <NUM> by supplying positive pressure to the suction opening of suction nozzle <NUM> (step S230B), then ends die mounting processing.

<FIG> illustrates states of a countermeasure when die D being picked up by suction nozzle <NUM> breaks. Control device <NUM>, if determining that die D broke while being pushed up by pusher pin <NUM> (refer to <FIG>and <FIG>), raises suction nozzle <NUM> with the broken die D still held by the suction nozzle <NUM>, and performs drive control of head moving device <NUM> such that suction nozzle <NUM> is moved directly above discard box <NUM>. Here, control device <NUM> moves suction nozzle <NUM> on a path that avoids going above component camera <NUM> and board S such that fragments of broken die D do not fall on component camera <NUM> or board S. Also, control device <NUM> supplies positive pressure to the suction opening of suction nozzle <NUM> to release die D from suction nozzle <NUM> and drop it into discard box <NUM>.

In an embodiment above, mounting head <NUM> is provided with two raising and lowering devices (first raising and lowering device <NUM> and second raising and lowering device <NUM>), but may be provided with only one raising and lowering device.

In an embodiment above, load cell <NUM> is provided on mounting head <NUM> as a load measuring section, but the breaking of die D being picked up may be determined based on the load F applied to suction nozzle <NUM>. Further, a load cell for measuring a load applied to pusher pin <NUM> may be provided in die peeling device <NUM> and the breaking of the die D being picked up may be determined based on the load applied to the pusher pin.

In an embodiment above, load cell <NUM> for measuring load F applied to suction nozzle <NUM> is provided on mounting head <NUM>, but the load applied to suction nozzle <NUM> may be measured by detecting or estimating the load current of second linear motor <NUM>.

Claim 1:
A die mounting device (<NUM>) configured to pick up a die (D) from a sheet (<NUM>) to which a wafer (W) divided into multiple dies (D) is affixed using a nozzle (<NUM>) and mount the die (D) on a target object (S), the die mounting device (<NUM>) comprising:
a board conveyance device (<NUM>) for loading and fixing the target object (S) at a mounting position,
a tape supply device (<NUM>) comprising a reel around which a tape for supplying components to the mounting device (<NUM>) is wound;
a head (<NUM>) including the nozzle (<NUM>) configured to be raised and lowered and to pick up die (D) from the sheet (<NUM>) or a component supplied from tape supply device (<NUM>);
a peeling device (<NUM>) configured to peel the die (D) from the sheet (<NUM>) by pushing the die (D) to be picked up by the nozzle (<NUM>) from underneath the sheet (<NUM>) using a pusher pin (<NUM>);
a component camera (<NUM>) provided between the board conveyance device (<NUM>) and the tape supply device (<NUM>) and configured to image a die (D) held by suction nozzle (<NUM>) when suction nozzle (<NUM>) holding the die (D) passes above component camera (<NUM>) and to output the image to a control device (<NUM>);
a load measuring section (<NUM>) configured to measure a load applied to the nozzle (<NUM>) or the pusher pin (<NUM>); wherein
the control device (<NUM>) is configured to control the head (<NUM>) and the peeling device (<NUM>) such that the die (D) is picked up by the nozzle (<NUM>) by being peeled from the sheet (<NUM>) with the pusher pin (<NUM>) pushing the die (D) from underneath the sheet (<NUM>) in a state with the nozzle (<NUM>) contacting the die (D), and determine whether the die (D) has broken based on the load measured by the load measuring section (<NUM>) when the die (D) is pushed up by the pusher pin (<NUM>); and wherein
the control device (<NUM>) is configured to, when determining that the die (D) has broken, control the mounting head (<NUM>) to pick up the die (D) using the nozzle (<NUM>) and discard the die (D) to a specified discard location remote of the peeling device (<NUM>) on a path that avoids going above component camera (<NUM>) and target object (S).